StelUtils.hpp   StelUtils.hpp 
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double getDeltaTByMontenbruckPfleger(const double jDay); double getDeltaTByMontenbruckPfleger(const double jDay);
//! Get Delta-T estimation for a given date. //! Get Delta-T estimation for a given date.
//! Implementation of algorithm by Reingold & Dershowitz (1997, 2001 , 2002, 2007) for DeltaT computation. //! Implementation of algorithm by Reingold & Dershowitz (1997, 2001 , 2002, 2007) for DeltaT computation.
//! This is again mostly a data fit based on the table in Meeus, Ast ronomical Algorithms (1991). //! This is again mostly a data fit based on the table in Meeus, Ast ronomical Algorithms (1991).
//! This is the version given in the 3rd edition (2007) which added the fit for 1700..1799 omitted from previous editions. //! This is the version given in the 3rd edition (2007) which added the fit for 1700..1799 omitted from previous editions.
//! @param jDay the date and time expressed as a julian day //! @param jDay the date and time expressed as a julian day
//! @return Delta-T in seconds //! @return Delta-T in seconds
double getDeltaTByReingoldDershowitz(const double jDay); double getDeltaTByReingoldDershowitz(const double jDay);
//! Get Delta-T estimation for a given date.
//! Implementation of algorithm by Banjevic (2006) for DeltaT comput
ation.
//! Source: Ancient eclipses and dating the fall of Babylon
//! Banjevic, B.
//! Publications of the Astronomical Observatory of Belgrade, Vol. 8
0, p. 251-257 (2006)
//! 2006POBeo..80..251B [http://adsabs.harvard.edu/abs/2006POBeo..80
..251B]
//! @param jDay the date and time expressed as a julian day
//! @return Delta-T in seconds
double getDeltaTByBanjevic(const double jDay);
//! Get Delta-T estimation for a given date.
//! Implementation of algorithm by Islam, Sadiq & Qureshi (2008 + re
visited 2013) for DeltaT computation.
//! Source: Error Minimization of Polynomial Approximation of DeltaT
//! Islam, S. & Sadiq, M. & Qureshi, M. S.
//! Journal of Astrophysics & Astronomy, Vol. 29, p. 363–366 (2008)
//! http://www.ias.ac.in/jaa/dec2008/JAA610.pdf
//! Note: These polynomials are based on the uncorrected deltaT tabl
e from the Astronomical Almanac, thus
//! ndot = -26.0 arcsec/cy^2. Meeus & Simons (2000) corrected the de
ltaT table for years before 1955.5 using
//! ndot = -25.7376 arcsec/cy^2. Therefore the accuracies stated by
Meeus & Simons are correct and cannot be
//! compared with accuracies from Islam & Sadiq & Qureshi.
//! @param jDay the date and time expressed as a julian day
//! @return Delta-T in seconds
double getDeltaTByIslamSadiqQureshi(const double jDay);
//! Get Secular Acceleration estimation for a given year. //! Get Secular Acceleration estimation for a given year.
//! Method described is here: http://eclipse.gsfc.nasa.gov/SEcat5/se cular.html //! Method described is here: http://eclipse.gsfc.nasa.gov/SEcat5/se cular.html
//! For adapting from -26 to -25.858, use -0.91072 * (-25.858 + 26.0 ) = -0.12932224 //! For adapting from -26 to -25.858, use -0.91072 * (-25.858 + 26.0 ) = -0.12932224
//! For adapting from -26 to -23.895, use -0.91072 * (-23.895 + 26.0 ) = -1.9170656 //! For adapting from -26 to -23.895, use -0.91072 * (-23.895 + 26.0 ) = -1.9170656
//! @param jDay the JD //! @param jDay the JD
//! @param ndot value n-dot which use in the algorithm //! @param ndot value n-dot which use in the algorithm
//! @return SecularAcceleration in seconds //! @return SecularAcceleration in seconds
//! @note n-dot for secular acceleration of the Moon in ELP2000-82B is -23.8946 "/cy/cy //! @note n-dot for secular acceleration of the Moon in ELP2000-82B is -23.8946 "/cy/cy
double getMoonSecularAcceleration(const double jDay, const double nd ot); double getMoonSecularAcceleration(const double jDay, const double nd ot);
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