Main class for Stellarium core processing. More...

#include <StelCore.hpp>

Public Types
enum	FrameType { FrameUninitialized, FrameAltAz, FrameHeliocentricEclipticJ2000, FrameObservercentricEclipticJ2000, FrameObservercentricEclipticOfDate, FrameEquinoxEqu, FrameJ2000, FrameGalactic, FrameSupergalactic }
	Supported reference frame types. More...

enum	ProjectionType { ProjectionPerspective, ProjectionStereographic, ProjectionFisheye, ProjectionOrthographic, ProjectionEqualArea, ProjectionHammer, ProjectionSinusoidal, ProjectionMercator, ProjectionMiller, ProjectionCylinder }
	Available projection types. More...

enum	RefractionMode { RefractionAuto, RefractionOn, RefractionOff }
	Available refraction mode. More...

enum	DeltaTAlgorithm { WithoutCorrection, Schoch, Clemence, IAU, AstronomicalEphemeris, TuckermanGoldstine, MullerStephenson, Stephenson1978, SchmadelZech1979, MorrisonStephenson1982, StephensonMorrison1984, StephensonHoulden, Espenak, Borkowski, SchmadelZech1988, ChaprontTouze, StephensonMorrison1995, Stephenson1997, ChaprontMeeus, JPLHorizons, MeeusSimons, MontenbruckPfleger, ReingoldDershowitz, MorrisonStephenson2004, Reijs, EspenakMeeus, EspenakMeeusZeroMoonAccel, Banjevic, IslamSadiqQureshi, KhalidSultanaZaidi, StephensonMorrisonHohenkerk2016, Henriksson2017, Custom }
	Available DeltaT algorithms. More...

Public Slots
void	moveObserverTo (const StelLocation &target, double duration=1., double durationIfPlanetChange=1.)
	Smoothly move the observer to the given location. More...

void	setCurrentProjectionType (ProjectionType type)
	Set the current ProjectionType to use.

ProjectionType	getCurrentProjectionType () const

QString	getCurrentProjectionTypeKey (void) const
	Get the current Mapping used by the Projection.

void	setCurrentProjectionTypeKey (QString type)
	Set the current ProjectionType to use from its key.

QString	getCurrentProjectionNameI18n () const

QStringList	getAllProjectionTypeKeys () const
	Get the list of all the available projections.

void	setCurrentDeltaTAlgorithm (DeltaTAlgorithm algorithm)
	Set the current algorithm and nDot used therein for time correction (DeltaT)

DeltaTAlgorithm	getCurrentDeltaTAlgorithm () const
	Get the current algorithm for time correction (DeltaT)

QString	getCurrentDeltaTAlgorithmDescription (void) const
	Get description of the current algorithm for time correction.

QString	getCurrentDeltaTAlgorithmKey (void) const
	Get the current algorithm used by the DeltaT.

void	setCurrentDeltaTAlgorithmKey (QString type)
	Set the current algorithm to use from its key.

void	setMaskType (StelProjector::StelProjectorMaskType m)
	Set the mask type.

void	setFlagGravityLabels (bool gravity)
	Set the flag with decides whether to arrage labels so that they are aligned with the bottom of a 2d screen, or a 3d dome. More...

bool	getFlagGravityLabels () const
	return whether dome-aligned labels are in use

void	setDefaultAngleForGravityText (float a)
	Set the offset rotation angle in degree to apply to gravity text (only if gravityLabels is set to false).

void	setFlipHorz (bool flip)
	Set the horizontal flip status. More...

void	setFlipVert (bool flip)
	Set the vertical flip status. More...

bool	getFlipHorz (void) const
	Get the state of the horizontal flip. More...

bool	getFlipVert (void) const
	Get the state of the vertical flip. More...

double	getViewportHorizontalOffset (void) const
	Get current value for horizontal viewport offset [-50...50] An offset of 50 percent means projective image center is on the right screen border.

void	setViewportHorizontalOffset (double newOffsetPct)
	Set horizontal viewport offset. More...

double	getViewportVerticalOffset (void) const
	Get current value for vertical viewport offset [-50...50] An offset of 50 percent means projective image center is on the upper screen border.

void	setViewportVerticalOffset (double newOffsetPct)
	Set vertical viewport offset. More...

void	setViewportOffset (double newHorizontalOffsetPct, double newVerticalOffsetPct)

void	setViewportStretch (float stretch)
	Can be used in specialized setups, intended e.g. More...

QString	getDefaultLocationID () const
	Get the location used by default at startup.

void	setDefaultLocationID (const QString &id)
	Set the location to use by default at startup.

void	returnToDefaultLocation ()
	Return to the default location.

void	returnToHome ()
	Return to the default location and set default landscape with atmosphere and fog effects.

double	getJDOfLastJDUpdate () const
	Returns the JD of the last time resetSync() was called.

void	setMilliSecondsOfLastJDUpdate (qint64 millis)
	Sets the system date which corresponds to the jdOfLastJDUpdate. More...

qint64	getMilliSecondsOfLastJDUpdate () const
	Returns the system date of the last time resetSync() was called.

void	setJD (double newJD)
	Set the current date in Julian Day (UT)

void	setJDE (double newJDE)
	Set the current date in Julian Day (TT). More...

double	getJD () const
	Get the current date in Julian Day (UT).

double	getJDE () const
	Get the current date in Julian Day (TT). More...

double	getSolutionEquationOfTime (const double JDE) const
	Get solution of equation of time Source: J. More...

bool	getUseDST () const

void	setUseDST (const bool b)

bool	getUseCustomTimeZone (void) const

void	setUseCustomTimeZone (const bool b)

void	setMJDay (double MJD)
	Set the current date in Modified Julian Day (UT). More...

double	getMJDay () const
	Get the current date in Modified Julian Day (UT)

double	computeDeltaT (const double JD)
	Compute DeltaT estimation for a given date. More...

double	getDeltaT () const
	Get current DeltaT.

bool	getUseNutation () const

void	setUseNutation (bool use)
	Set whether you want computation and simulation of nutation (a slight wobble of Earth's axis, just a few arcseconds).

bool	getUseTopocentricCoordinates () const

void	setUseTopocentricCoordinates (bool use)
	Set whether you want computation and simulation of nutation (a slight wobble of Earth's axis, just a few arcseconds).

double	getPresetSkyTime () const
	Return the preset sky time in JD.

void	setPresetSkyTime (double d)
	Set the preset sky time from a JD.

void	setTimeRate (double ts)
	Set time speed in JDay/sec.

double	getTimeRate () const
	Get time speed in JDay/sec.

void	revertTimeDirection (void)

void	increaseTimeSpeed ()
	Increase the time speed.

void	decreaseTimeSpeed ()
	Decrease the time speed.

void	increaseTimeSpeedLess ()
	Increase the time speed, but not as much as with increaseTimeSpeed()

void	decreaseTimeSpeedLess ()
	Decrease the time speed but not as much as with decreaseTimeSpeed()

void	setZeroTimeSpeed ()
	Set time speed to 0, i.e. freeze the passage of simulation time.

void	setRealTimeSpeed ()
	Set real time speed, i.e. 1 sec/sec.

void	toggleRealTimeSpeed ()
	Set real time speed or pause simulation if we are already in realtime speed.

bool	getRealTimeSpeed () const
	Get whether it is real time speed, i.e. 1 sec/sec.

void	setTimeNow ()
	Set stellarium time to current real world time.

void	setTodayTime (const QTime &target)
	Set the time to some value, leaving the day the same.

bool	getIsTimeNow () const
	Get whether the current stellarium time is the real world time.

QTime	getInitTodayTime (void) const
	get the initial "today time" from the config file

void	setInitTodayTime (const QTime &time)
	set the initial "today time" from the config file

void	setPresetSkyTime (QDateTime dateTime)
	Set the preset sky time from a QDateTime.

void	addMinute ()
	Add one [Earth, solar] minute to the current simulation time.

void	addHour ()
	Add one [Earth, solar] hour to the current simulation time.

void	addDay ()
	Add one [Earth, solar] day to the current simulation time.

void	addWeek ()
	Add one [Earth, solar] week to the current simulation time.

void	addSiderealDay ()
	Add one sidereal day to the simulation time. More...

void	addSiderealWeek ()
	Add seven sidereal days to the simulation time. More...

void	addSiderealYear ()
	Add one sidereal year to the simulation time. More...

void	addSiderealYears (float n=100.f)
	Add n sidereal years to the simulation time. More...

void	subtractMinute ()
	Subtract one [Earth, solar] minute to the current simulation time.

void	subtractHour ()
	Subtract one [Earth, solar] hour to the current simulation time.

void	subtractDay ()
	Subtract one [Earth, solar] day to the current simulation time.

void	subtractWeek ()
	Subtract one [Earth, solar] week to the current simulation time.

void	subtractSiderealDay ()
	Subtract one sidereal day to the simulation time. More...

void	subtractSiderealWeek ()
	Subtract seven sidereal days to the simulation time. More...

void	subtractSiderealYear ()
	Subtract one sidereal year to the simulation time. More...

void	subtractSiderealYears (float n=100.f)
	Subtract n sidereal years to the simulation time. More...

void	addSynodicMonth ()
	Add one synodic month to the simulation time.

void	addSaros ()
	Add one saros (223 synodic months) to the simulation time.

void	addDraconicYear ()
	Add one draconic year to the simulation time.

void	addDraconicMonth ()
	Add one draconic month to the simulation time.

void	addAnomalisticMonth ()
	Add one anomalistic month to the simulation time.

void	addAnomalisticYear ()
	Add one anomalistic year to the simulation time.

void	addAnomalisticYears (float n=100.f)
	Add n anomalistic years to the simulation time.

void	addMeanTropicalMonth ()
	Add one mean tropical month to the simulation time.

void	addMeanTropicalYear ()
	Add one mean tropical year to the simulation time.

void	addMeanTropicalYears (float n=100.f)
	Add n mean tropical years to the simulation time.

void	addTropicalYear ()
	Add one tropical year to the simulation time.

void	addCalendricMonth ()
	Add one calendric month to the simulation time.

void	addJulianYear ()
	Add one Julian year to the simulation time.

void	addJulianYears (float n=100.f)
	Add n Julian years to the simulation time.

void	addGaussianYear ()
	Add one Gaussian year to the simulation time. More...

void	subtractSynodicMonth ()
	Subtract one synodic month to the simulation time.

void	subtractSaros ()
	Subtract one saros (223 synodic months) to the simulation time.

void	subtractDraconicYear ()
	Subtract one draconic year to the simulation time.

void	subtractDraconicMonth ()
	Subtract one draconic month to the simulation time.

void	subtractAnomalisticMonth ()
	Subtract one anomalistic month to the simulation time.

void	subtractAnomalisticYear ()
	Subtract one anomalistic year to the simulation time.

void	subtractAnomalisticYears (float n=100.f)
	Subtract n anomalistic years to the simulation time.

void	subtractMeanTropicalMonth ()
	Subtract one mean tropical month to the simulation time.

void	subtractMeanTropicalYear ()
	Subtract one mean tropical year to the simulation time.

void	subtractMeanTropicalYears (float n=100.f)
	Subtract n mean tropical years to the simulation time.

void	subtractTropicalYear ()
	Subtract one tropical year to the simulation time.

void	subtractCalendricMonth ()
	Subtract one calendric month to the simulation time.

void	subtractJulianYear ()
	Subtract one Julian year to the simulation time.

void	subtractJulianYears (float n=100.f)
	Subtract n Julian years to the simulation time.

void	subtractGaussianYear ()
	Subtract one Gaussian year to the simulation time.

void	addSolarDays (double d)
	Add a number of Earth Solar days to the current simulation time. More...

void	addSiderealDays (double d)
	Add a number of sidereal days to the current simulation time, based on the observer body's rotational period. More...

void	moveObserverToSelected ()
	Move the observer to the selected object. More...

void	setDeltaTCustomYear (float y)
	Set central year for custom equation for calculation of DeltaT. More...

void	setDeltaTCustomNDot (float v)
	Set n-dot for custom equation for calculation of DeltaT. More...

void	setDeltaTCustomEquationCoefficients (Vec3f c)
	Set coefficients for custom equation for calculation of DeltaT. More...

float	getDeltaTCustomYear () const
	Get central year for custom equation for calculation of DeltaT.

float	getDeltaTCustomNDot () const
	Get n-dot for custom equation for calculation of DeltaT.

float	getDeltaTnDot () const
	Get n-dot for current DeltaT algorithm.

Vec3f	getDeltaTCustomEquationCoefficients () const
	Get coefficients for custom equation for calculation of DeltaT.

void	initEphemeridesFunctions ()
	initialize ephemerides calculation functions

bool	de430IsAvailable ()
	true if DE430 ephemeris file has been found

bool	de431IsAvailable ()
	true if DE431 ephemeris file has been found

bool	de430IsActive ()
	true if DE430 ephemeris is in use

bool	de431IsActive ()
	true if DE431 ephemeris is in use

void	setDe430Active (bool status)
	switch DE430 use to More...

void	setDe431Active (bool status)
	switch DE431 use to More...

QString	getIAUConstellation (const Vec3d positionEqJnow) const
	Return 3-letter abbreviation of IAU constellation name for position in equatorial coordinates on the current epoch. More...

Signals
void	locationChanged (StelLocation)
	This signal is emitted when the observer location has changed.

void	targetLocationChanged (StelLocation)
	This signal is emitted whenever the targetted location changes.

void	currentTimeZoneChanged (QString)
	This signal is emitted when the current timezone name is changed.

void	timeRateChanged (double rate)
	This signal is emitted when the time rate has changed.

void	timeSyncOccurred (double jDay)
	This signal is emitted whenever the time is re-synced. More...

void	dateChanged ()
	This signal is emitted when the date has changed.

void	dateChangedForMonth ()
	This signal is emitted when the date has changed for a month.

void	dateChangedByYear ()
	This signal is emitted when the date has changed by one year.

void	flipHorzChanged (bool b)
	This signal indicates a horizontal display flip.

void	flipVertChanged (bool b)
	This signal indicates a vertical display flip.

void	flagUseNutationChanged (bool b)
	This signal indicates a switch in use of nutation.

void	flagUseTopocentricCoordinatesChanged (bool b)
	This signal indicates a switch in use of topocentric coordinates.

void	currentProjectionTypeChanged (StelCore::ProjectionType newType)
	Emitted whenever the projection type changes.

void	currentProjectionTypeKeyChanged (const QString &newValue)
	Emitted whenever the projection type changes.

void	currentProjectionNameI18nChanged (const QString &newValue)
	Emitted whenever the projection type changes.

void	flagGravityLabelsChanged (bool gravity)
	Emitted when gravity label use is changed.

Public Member Functions
void	init ()
	Init and load all main core components.

void	update (double deltaTime)
	Update all the objects with respect to the time. More...

void	windowHasBeenResized (float x, float y, float width, float height)
	Handle the resizing of the window.

void	preDraw ()
	Update core state before drawing modules.

void	postDraw ()
	Update core state after drawing modules.

StelProjectorP	getProjection2d () const
	Get a new instance of a simple 2d projection. More...

StelProjectorP	getProjection (FrameType frameType, RefractionMode refractionMode=RefractionAuto) const
	Get a new instance of projector using a modelview transformation corresponding to the given frame. More...

StelProjectorP	getProjection (StelProjector::ModelViewTranformP modelViewTransform, ProjectionType projType=(ProjectionType) 1000) const
	Get a new instance of projector using the given modelview transformation. More...

StelToneReproducer *	getToneReproducer ()
	Get the current tone reproducer used in the core.

const StelToneReproducer *	getToneReproducer () const
	Get the current tone reproducer used in the core.

StelSkyDrawer *	getSkyDrawer ()
	Get the current StelSkyDrawer used in the core.

const StelSkyDrawer *	getSkyDrawer () const
	Get the current StelSkyDrawer used in the core.

const StelGeodesicGrid *	getGeodesicGrid (int maxLevel) const
	Get an instance of StelGeodesicGrid which is garanteed to allow for at least maxLevel levels.

StelMovementMgr *	getMovementMgr ()
	Get the instance of movement manager.

const StelMovementMgr *	getMovementMgr () const
	Get the const instance of movement manager.

void	setClippingPlanes (double znear, double zfar)
	Set the near and far clipping planes.

void	getClippingPlanes (double zn, double zf) const
	Get the near and far clipping planes.

QString	projectionTypeKeyToNameI18n (const QString &key) const
	Get the translated projection name from its TypeKey for the current locale.

QString	projectionNameI18nToTypeKey (const QString &nameI18n) const
	Get the projection TypeKey from its translated name for the current locale.

StelProjector::StelProjectorParams	getCurrentStelProjectorParams () const
	Get the current set of parameters to use when creating a new StelProjector.

void	setCurrentStelProjectorParams (const StelProjector::StelProjectorParams &newParams)
	Set the set of parameters to use when creating a new StelProjector.

void	lookAtJ2000 (const Vec3d &pos, const Vec3d &up)
	Set vision direction.

Vec3d	altAzToEquinoxEqu (const Vec3d &v, RefractionMode refMode=RefractionAuto) const

Vec3d	equinoxEquToAltAz (const Vec3d &v, RefractionMode refMode=RefractionAuto) const

Vec3d	altAzToJ2000 (const Vec3d &v, RefractionMode refMode=RefractionAuto) const

Vec3d	j2000ToAltAz (const Vec3d &v, RefractionMode refMode=RefractionAuto) const

void	j2000ToAltAzInPlaceNoRefraction (Vec3f *v) const

Vec3d	galacticToJ2000 (const Vec3d &v) const

Vec3d	supergalacticToJ2000 (const Vec3d &v) const

Vec3d	equinoxEquToJ2000 (const Vec3d &v, RefractionMode refMode=RefractionAuto) const
	Transform position vector v from equatorial coordinates of date (which may also include atmospheric refraction) to those of J2000. More...

Vec3d	j2000ToJ1875 (const Vec3d &v) const
	Use fixed matrix to allow fast transformation of positions related to the IAU constellation borders.

Vec3d	j2000ToEquinoxEqu (const Vec3d &v, RefractionMode refMode=RefractionAuto) const
	Transform position vector v from equatorial coordinates J2000 to those of date (optionally corrected by refraction). More...

Vec3d	j2000ToGalactic (const Vec3d &v) const

Vec3d	j2000ToSupergalactic (const Vec3d &v) const

Vec3d	heliocentricEclipticToAltAz (const Vec3d &v, RefractionMode refMode=RefractionAuto) const
	Transform vector from heliocentric ecliptic coordinate to altazimuthal.

Vec3d	heliocentricEclipticToEquinoxEqu (const Vec3d &v) const
	Transform from heliocentric coordinate to equatorial at current equinox (for the planet where the observer stands)

StelProjector::ModelViewTranformP	getHeliocentricEclipticModelViewTransform (RefractionMode refMode=RefractionAuto) const
	Get the modelview matrix for heliocentric ecliptic (Vsop87) drawing.

StelProjector::ModelViewTranformP	getObservercentricEclipticJ2000ModelViewTransform (RefractionMode refMode=RefractionAuto) const
	Get the modelview matrix for observer-centric ecliptic (Vsop87) drawing.

StelProjector::ModelViewTranformP	getObservercentricEclipticOfDateModelViewTransform (RefractionMode refMode=RefractionAuto) const
	Get the modelview matrix for observer-centric ecliptic of Date drawing.

StelProjector::ModelViewTranformP	getEquinoxEquModelViewTransform (RefractionMode refMode=RefractionAuto) const
	Get the modelview matrix for observer-centric equatorial at equinox drawing.

StelProjector::ModelViewTranformP	getAltAzModelViewTransform (RefractionMode refMode=RefractionAuto) const
	Get the modelview matrix for observer-centric altazimuthal drawing.

StelProjector::ModelViewTranformP	getJ2000ModelViewTransform (RefractionMode refMode=RefractionAuto) const
	Get the modelview matrix for observer-centric J2000 equatorial drawing.

StelProjector::ModelViewTranformP	getGalacticModelViewTransform (RefractionMode refMode=RefractionAuto) const
	Get the modelview matrix for observer-centric Galactic equatorial drawing.

StelProjector::ModelViewTranformP	getSupergalacticModelViewTransform (RefractionMode refMode=RefractionAuto) const
	Get the modelview matrix for observer-centric Supergalactic equatorial drawing.

Vec3d	getObserverHeliocentricEclipticPos () const
	Return the observer heliocentric ecliptic position (GZ: presumably J2000)

const StelLocation &	getCurrentLocation () const
	Get the informations on the current location.

float	getUTCOffset (const double JD) const
	Get the UTC offset on the current location (in hours)

QString	getCurrentTimeZone () const

void	setCurrentTimeZone (const QString &tz)

const QSharedPointer< class Planet >	getCurrentPlanet () const

const StelObserver *	getCurrentObserver () const
	Unfortunately we also need this. More...

void	setObserver (StelObserver *obs)
	Replaces the current observer. StelCore assumes ownership of the observer.

SphericalCap	getVisibleSkyArea () const

double	getLocalSiderealTime () const
	Get the sidereal time shifted by the observer longitude. More...

double	getLocalSiderealDayLength () const
	Get the duration of a sidereal day for the current observer in day.

double	getLocalSiderealYearLength () const
	Get the duration of a sidereal year for the current observer in days.

QString	getStartupTimeMode () const
	Return the startup mode, can be "actual" (i.e. More...

void	setStartupTimeMode (const QString &s)

QString	getCurrentDeltaTAlgorithmValidRangeDescription (const double JD, QString *marker) const
	Get info about valid range for current algorithm for calculation of Delta-T. More...

bool	isBrightDaylight () const
	Checks for altitude of the Sun - is it night or day? More...

double	getCurrentEpoch () const
	Get value of the current Julian epoch (i.e. current year with decimal fraction, e.g. 2012.34567)

QString	getDefaultProjectionTypeKey (void) const
	Get the default Mapping used by the Projection.

Vec3d	getMouseJ2000Pos (void) const

Static Public Attributes
static const Mat4d	matJ2000ToVsop87
	Rotation matrix from equatorial J2000 to ecliptic (VSOP87A).

static const Mat4d	matVsop87ToJ2000
	Rotation matrix from ecliptic (VSOP87A) to equatorial J2000.

static const Mat4d	matJ2000ToGalactic
	Rotation matrix from J2000 to Galactic reference frame, using FITS convention.

static const Mat4d	matGalacticToJ2000
	Rotation matrix from Galactic to J2000 reference frame, using FITS convention.

static const Mat4d	matJ2000ToSupergalactic
	Rotation matrix from J2000 to Supergalactic reference frame.

static const Mat4d	matSupergalacticToJ2000
	Rotation matrix from Supergalactic to J2000 reference frame.

static const double	JD_SECOND

static const double	JD_MINUTE

static const double	JD_HOUR

static const double	JD_DAY

static const double	ONE_OVER_JD_SECOND

static const double	TZ_ERA_BEGINNING

Properties
bool	flipHorz

bool	flipVert

bool	flagUseNutation

bool	flagUseTopocentricCoordinates

ProjectionType	currentProjectionType

QString	currentProjectionTypeKey
	This is just another way to access the projection type, by string instead of enum.

QString	currentProjectionNameI18n
	Read-only property returning the localized projection name.

bool	flagGravityLabels

QString	currentTimeZone

Detailed Description

This class provides services like management of sky projections, tone conversion, or reference frame conversion. It is used by the various StelModules to update and display themselves. There is currently only one StelCore instance in Stellarium, but in the future they may be more, allowing for example to display several independent views of the sky at the same time.

Author: Fabien Chereau, Matthew Gates, Georg Zotti

Member Enumeration Documentation

◆ DeltaTAlgorithm

enum StelCore::DeltaTAlgorithm

Enumerator
WithoutCorrection	Without correction, DeltaT is Zero. Like Stellarium versions before 0.12.
Schoch	Schoch (1931) algorithm for DeltaT.
Clemence	Clemence (1948) algorithm for DeltaT.
IAU	IAU (1952) algorithm for DeltaT (based on observations by Spencer Jones (1939))
AstronomicalEphemeris	Astronomical Ephemeris (1960) algorithm for DeltaT.
TuckermanGoldstine	Tuckerman (1962, 1964) & Goldstine (1973) algorithm for DeltaT.
MullerStephenson	Muller & Stephenson (1975) algorithm for DeltaT.
Stephenson1978	Stephenson (1978) algorithm for DeltaT.
SchmadelZech1979	Schmadel & Zech (1979) algorithm for DeltaT.
MorrisonStephenson1982	Morrison & Stephenson (1982) algorithm for DeltaT (used by RedShift)
StephensonMorrison1984	Stephenson & Morrison (1984) algorithm for DeltaT.
StephensonHoulden	Stephenson & Houlden (1986) algorithm for DeltaT.
Espenak	Espenak (1987, 1989) algorithm for DeltaT.
Borkowski	Borkowski (1988) algorithm for DeltaT.
SchmadelZech1988	Schmadel & Zech (1988) algorithm for DeltaT.
ChaprontTouze	Chapront-Touzé & Chapront (1991) algorithm for DeltaT.
StephensonMorrison1995	Stephenson & Morrison (1995) algorithm for DeltaT.
Stephenson1997	Stephenson (1997) algorithm for DeltaT.
ChaprontMeeus	Chapront, Chapront-Touze & Francou (1997) & Meeus (1998) algorithm for DeltaT.
JPLHorizons	JPL Horizons algorithm for DeltaT.
MeeusSimons	Meeus & Simons (2000) algorithm for DeltaT.
MontenbruckPfleger	Montenbruck & Pfleger (2000) algorithm for DeltaT.
ReingoldDershowitz	Reingold & Dershowitz (2002, 2007) algorithm for DeltaT.
MorrisonStephenson2004	Morrison & Stephenson (2004, 2005) algorithm for DeltaT.
Reijs	Reijs (2006) algorithm for DeltaT.
EspenakMeeus	Espenak & Meeus (2006) algorithm for DeltaT (Recommended, default)
EspenakMeeusZeroMoonAccel	Espenak & Meeus (2006) algorithm for DeltaT (but without additional Lunar acceleration. FOR TESTING ONLY, NONPUBLIC)
Banjevic	Banjevic (2006) algorithm for DeltaT.
IslamSadiqQureshi	Islam, Sadiq & Qureshi (2008 + revisited 2013) algorithm for DeltaT (6 polynomials)
KhalidSultanaZaidi	M. Khalid, Mariam Sultana and Faheem Zaidi polynomial approximation of time period 1620-2013 (2014)
StephensonMorrisonHohenkerk2016	Stephenson, Morrison, Hohenkerk (2016) RSPA paper provides spline fit to observations for -720..2016 and else parabolic fit.
Henriksson2017	Henriksson (2017) algorithm for DeltaT (The solution for Schoch formula for DeltaT (1931), but with ndot=-30.128"/cy^2)
Custom	User defined coefficients for quadratic equation for DeltaT.

◆ FrameType

enum StelCore::FrameType

Enumerator
FrameUninitialized	Reference frame is not set (FMajerech: Added to avoid condition on uninitialized value in StelSkyLayerMgr::draw())
FrameAltAz	Altazimuthal reference frame centered on observer.
FrameHeliocentricEclipticJ2000	Fixed-ecliptic reference frame centered on the Sun. GZ: This is J2000 ecliptical / almost VSOP87.
FrameObservercentricEclipticJ2000	Fixed-ecliptic reference frame centered on the Observer. GZ: was ObservercentricEcliptic, but renamed because it is Ecliptic of J2000!
FrameObservercentricEclipticOfDate	Moving ecliptic reference frame centered on the Observer. GZ new for V0.14: Ecliptic of date, i.e. includes the precession of the ecliptic.
FrameEquinoxEqu	Equatorial reference frame at the current equinox centered on the observer. The north pole follows the precession of the planet on which the observer is located. On Earth, this may include nutation if so configured. Has been corrected for V0.14 to really properly reflect ecliptical motion and precession (Vondrak 2011 model) and nutation.
FrameJ2000	Equatorial reference frame at the J2000 equinox centered on the observer. This is also the ICRS reference frame.
FrameGalactic	Galactic reference frame centered on observer.
FrameSupergalactic	Supergalactic reference frame centered on observer.

◆ ProjectionType

enum StelCore::ProjectionType

A value of 1000 indicates the default projection

Enumerator
ProjectionPerspective	Perspective projection.
ProjectionStereographic	Stereographic projection.
ProjectionFisheye	Fisheye projection.
ProjectionOrthographic	Orthographic projection.
ProjectionEqualArea	Equal Area projection.
ProjectionHammer	Hammer-Aitoff projection.
ProjectionSinusoidal	Sinusoidal projection.
ProjectionMercator	Mercator projection.
ProjectionMiller	Miller cylindrical projection.
ProjectionCylinder	Cylinder projection.

◆ RefractionMode

enum StelCore::RefractionMode

Enumerator
RefractionAuto	Automatically decide to add refraction if atmosphere is activated.
RefractionOn	Always add refraction (i.e. apparent coordinates)
RefractionOff	Never add refraction (i.e. geometric coordinates)

Member Function Documentation

◆ addGaussianYear

void StelCore::addGaussianYear ( )

slot

The Gaussian Year is 365.2568983 days, and is C.F.Gauss's value for the Sidereal Year. Note that 1 GaussY=2 π/k where k is the Gaussian gravitational constant. A massless body orbits one solar mass in 1AU distance in a Gaussian Year.

◆ addSiderealDay

void StelCore::addSiderealDay ( )

slot

The length of time depends on the current planetary body on which the observer is located.

◆ addSiderealDays

void StelCore::addSiderealDays ( double d )

slot

Parameters

d	the decimal number of sidereal days to add (use negative values to subtract)

◆ addSiderealWeek

void StelCore::addSiderealWeek ( )

slot

The length of time depends on the current planetary body on which the observer is located.

◆ addSiderealYear

void StelCore::addSiderealYear ( )

slot

The length of time depends on the current planetary body on which the observer is located. Sidereal year connected to orbital period of planets.

◆ addSiderealYears

void StelCore::addSiderealYears ( float n = 100.f )

slot

The length of time depends on the current planetary body on which the observer is located. Sidereal year connected to orbital period of planets.

◆ addSolarDays

void StelCore::addSolarDays ( double d )

slot

Parameters

d	the decimal number of days to add (use negative values to subtract)

◆ computeDeltaT

double StelCore::computeDeltaT ( const double JD )

slot

DeltaT is the accumulated effect of earth's rotation slowly getting slower, mostly caused by tidal braking by the Moon. For accurate positioning of objects in the sky, we must compute earth-based clock-dependent things like earth rotation, hour angles etc. using plain UT, but all orbital motions or rotation of the other planets must be computed in TT, which is a regular time frame. Also satellites are computed in the UT frame because (1) they are short-lived and (2) must follow paths over earth ground. (Note that we make no further difference between TT and DT, those might differ by milliseconds at best but are regarded equivalent for our purpose.)

Parameters

JD	the date and time expressed as a Julian Day

Returns: DeltaT in seconds

Note: Thanks to Rob van Gent who created a collection from many formulas for calculation of DeltaT: http://www.staff.science.uu.nl/~gent0113/deltat/deltat.htm; Use this only if needed, prefer calling getDeltaT() for access to the current value.; Up to V0.15.1, if the requested year was outside validity range, we returned zero or some useless value. Starting with V0.15.2 the value from the edge of the defined range is returned instead if not explicitly zero is given in the source. Limits can be queried with getCurrentDeltaTAlgorithmValidRangeDescription()

◆ equinoxEquToJ2000()

Vec3d StelCore::equinoxEquToJ2000	(	const Vec3d &	v,
		RefractionMode	refMode = `RefractionAuto`
	)		const

Use refMode=StelCore::RefractionOff if you don't want any atmosphere correction. Use refMode=StelCore::RefractionOn to create observed (apparent) coordinates (which are subject to refraction). Use refMode=StelCore::RefractionAuto to correct coordinates for refraction only when atmosphere is active.

◆ getCurrentDeltaTAlgorithmValidRangeDescription()

QString StelCore::getCurrentDeltaTAlgorithmValidRangeDescription	(	const double	JD,
		QString *	marker
	)		const

Parameters

JD	the Julian Day number to test.
marker	receives a string: "*" if jDay is outside valid range, or "?" if range unknown, else an empty string.

Returns: valid range as explanatory string.

◆ getCurrentObserver()

const StelObserver* StelCore::getCurrentObserver ( ) const

Returns the current observer. Note that the observer object may be deleted at any time when control returns to StelCore.

◆ getFlipHorz

bool StelCore::getFlipHorz ( void ) const

slot

Returns: True if flipped horizontally, else false.

◆ getFlipVert

bool StelCore::getFlipVert ( void ) const

slot

Returns: True if flipped vertically, else false.

◆ getIAUConstellation

QString StelCore::getIAUConstellation ( const Vec3d positionEqJnow ) const

slot

Follows 1987PASP...99..695R: Nancy Roman: Identification of a Constellation from a Position Data file from ADC catalog VI/42 with her amendment from 1999-12-30.

Parameters

positionEqJnow position vector in rectangular equatorial coordinates of current epoch&equinox.

◆ getJDE

double StelCore::getJDE ( ) const

slot

The name is derived from the classical name "Ephemeris Time", of which TT is the successor. It is still frequently used in the literature.

◆ getLocalSiderealTime()

double StelCore::getLocalSiderealTime ( ) const

Returns: the local sidereal time in radian

◆ getProjection() [1/2]

StelProjectorP StelCore::getProjection	(	FrameType	frameType,
		RefractionMode	refractionMode = `RefractionAuto`
	)		const

If not specified the refraction effect is included if atmosphere is on.

◆ getProjection() [2/2]

StelProjectorP StelCore::getProjection	(	StelProjector::ModelViewTranformP	modelViewTransform,
		ProjectionType	projType = `(ProjectionType) 1000`
	)		const

If not specified the projection used is the one currently used as default.

◆ getProjection2d()

StelProjectorP StelCore::getProjection2d ( ) const

This projection cannot be used to project or unproject but only for 2d painting

◆ getSolutionEquationOfTime

double StelCore::getSolutionEquationOfTime ( const double JDE ) const

slot

Meeus "Astronomical Algorithms" (2nd ed., with corrections as of August 10, 2009) p.183-187.

Parameters

JDE	JD in Dynamical Time (previously called Ephemeris Time)

Returns: time in minutes

◆ getStartupTimeMode()

QString StelCore::getStartupTimeMode ( ) const

take current time from system), "today" (take some time e.g. on the evening of today) or "preset" (completely preconfigured).

◆ getUseNutation

bool StelCore::getUseNutation ( ) const

inlineslot

Returns: whether nutation is currently used.

◆ getUseTopocentricCoordinates

bool StelCore::getUseTopocentricCoordinates ( ) const

inlineslot

Returns: whether topocentric coordinates are currently used.

◆ isBrightDaylight()

bool StelCore::isBrightDaylight ( ) const

Returns: true if sun higher than about -6 degrees, i.e. "day" includes civil twilight.

Note: Useful mostly for brightness-controlled GUI decisions like font colors.

◆ j2000ToEquinoxEqu()

Vec3d StelCore::j2000ToEquinoxEqu	(	const Vec3d &	v,
		RefractionMode	refMode = `RefractionAuto`
	)		const

Use refMode=StelCore::RefractionOff if you don't want any atmosphere correction. Use refMode=StelCore::RefractionOn to correct observed (apparent) coordinates (which are subject to refraction). Use refMode=StelCore::RefractionAuto to correct coordinates for refraction only when atmosphere is active.

◆ moveObserverTo

void StelCore::moveObserverTo	(	const StelLocation &	target,
		double	duration = `1.`,
		double	durationIfPlanetChange = `1.`
	)

slot

Parameters

target	the target location
duration	direction of view move duration in s
durationIfPlanetChange	direction of view + planet travel move duration in s. This is used only if the destination planet is different from the starting one.

◆ moveObserverToSelected

void StelCore::moveObserverToSelected ( )

slot

This will only do something if the selected object is of the correct type - i.e. a planet.

◆ setDe430Active

void StelCore::setDe430Active ( bool status )

slot

Parameters

status (if de430IsAvailable()). DE430 is only used if date is within range of DE430.

◆ setDe431Active

void StelCore::setDe431Active ( bool status )

slot

Parameters

status (if de431IsAvailable()). DE431 is only used if DE430 is not used and the date is within range of DE431.

◆ setDeltaTCustomEquationCoefficients

void StelCore::setDeltaTCustomEquationCoefficients ( Vec3f c )

inlineslot

Parameters

c	the coefficients, e.g. -20,0,32

◆ setDeltaTCustomNDot

void StelCore::setDeltaTCustomNDot ( float v )

inlineslot

Parameters

v	the n-dot value, e.g. -26.0

◆ setDeltaTCustomYear

void StelCore::setDeltaTCustomYear ( float y )

inlineslot

Parameters

y	the year, e.g. 1820

◆ setFlagGravityLabels

void StelCore::setFlagGravityLabels ( bool gravity )

slot

◆ setFlipHorz

void StelCore::setFlipHorz ( bool flip )

slot

Parameters

flip	The new value (true = flipped, false = unflipped).

◆ setFlipVert

void StelCore::setFlipVert ( bool flip )

slot

Parameters

flip	The new value (true = flipped, false = unflipped).

◆ setJDE

void StelCore::setJDE ( double newJDE )

slot

The name is derived from the classical name "Ephemeris Time", of which TT is the successor. It is still frequently used in the literature.

◆ setMilliSecondsOfLastJDUpdate

void StelCore::setMilliSecondsOfLastJDUpdate ( qint64 millis )

slot

Usually, you do NOT want to call this method. This method is used by the RemoteSync plugin.

◆ setMJDay

void StelCore::setMJDay ( double MJD )

slot

MJD is simply JD-2400000.5, getting rid of large numbers and starting days at midnight. It is mostly used in satellite contexts.

◆ setViewportHorizontalOffset

void StelCore::setViewportHorizontalOffset ( double newOffsetPct )

slot

Argument will be clamped to be inside [-50...50] An offset of 50 percent means projective image center is on the right screen border Animation is available via StelMovementMgr::moveViewport()

◆ setViewportStretch

void StelCore::setViewportStretch ( float stretch )

slot

for multi-projector installations with edge blending.

Parameters

stretch [default 1] enlarge to stretch image to non-square pixels. A minimum value of 0.001 is enforced.

Note: This only influences the projected content. Things like ScreenImages keep square pixels.

◆ setViewportVerticalOffset

void StelCore::setViewportVerticalOffset ( double newOffsetPct )

slot

Argument will be clamped to be inside [-50...50] An offset of 50 percent means projective image center is on the upper screen border Setting to a negative value will move the visible horizon down, this may be desired esp. in cylindrical projection. Animation is available via StelMovementMgr::moveViewport()

◆ subtractSiderealDay

void StelCore::subtractSiderealDay ( )

slot

The length of time depends on the current planetary body on which the observer is located.

◆ subtractSiderealWeek

void StelCore::subtractSiderealWeek ( )

slot

The length of time depends on the current planetary body on which the observer is located.

◆ subtractSiderealYear

void StelCore::subtractSiderealYear ( )

slot

The length of time depends on the current planetary body on which the observer is located. Sidereal year connected to orbital period of planets.

◆ subtractSiderealYears

void StelCore::subtractSiderealYears ( float n = 100.f )

slot

The length of time depends on the current planetary body on which the observer is located. Sidereal year connected to orbital period of planets.

◆ timeSyncOccurred

void StelCore::timeSyncOccurred ( double jDay )

signal

This happens whenever the internal jDay is changed through setJDay/setMJDay and similar, and whenever the time rate changes.

◆ update()

void StelCore::update ( double deltaTime )

Parameters

deltaTime the time increment in sec.

Public Types

Public Slots

Signals

Public Member Functions

Static Public Attributes

Properties

Detailed Description

Member Enumeration Documentation

◆ DeltaTAlgorithm

◆ FrameType

◆ ProjectionType

◆ RefractionMode

Member Function Documentation

◆ addGaussianYear

◆ addSiderealDay

◆ addSiderealDays

◆ addSiderealWeek

◆ addSiderealYear

◆ addSiderealYears

◆ addSolarDays

◆ computeDeltaT

◆ equinoxEquToJ2000()

◆ getCurrentDeltaTAlgorithmValidRangeDescription()

◆ getCurrentObserver()

◆ getFlipHorz

◆ getFlipVert

◆ getIAUConstellation

◆ getJDE

◆ getLocalSiderealTime()

◆ getProjection() [1/2]

◆ getProjection() [2/2]

◆ getProjection2d()

◆ getSolutionEquationOfTime

◆ getStartupTimeMode()

◆ getUseNutation

◆ getUseTopocentricCoordinates

◆ isBrightDaylight()

◆ j2000ToEquinoxEqu()

◆ moveObserverTo

◆ moveObserverToSelected

◆ setDe430Active

◆ setDe431Active

◆ setDeltaTCustomEquationCoefficients

◆ setDeltaTCustomNDot

◆ setDeltaTCustomYear

◆ setFlagGravityLabels

◆ setFlipHorz

◆ setFlipVert

◆ setJDE

◆ setMilliSecondsOfLastJDUpdate

◆ setMJDay

◆ setViewportHorizontalOffset

◆ setViewportStretch

◆ setViewportVerticalOffset

◆ subtractSiderealDay

◆ subtractSiderealWeek

◆ subtractSiderealYear

◆ subtractSiderealYears

◆ timeSyncOccurred

◆ update()