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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