KSNumbers Class Reference

#include <ksnumbers.h>

Public Member Functions
	KSNumbers (long double jd)
void	computeConstantValues ()
dms	constAberr () const
double	dEcLong () const
double	dObliq () const
double	earthEccentricity () const
CachingDms	earthPerihelionLongitude () const
long double	getJD () const
double	julianCenturies () const
long double	julianDay () const
double	julianMillenia () const
const CachingDms *	obliquity () const
const Eigen::Matrix3d &	p1 () const
double	p1 (int i1, int i2) const
const Eigen::Matrix3d &	p1b () const
double	p1b (int i1, int i2) const
const Eigen::Matrix3d &	p2 () const
double	p2 (int i1, int i2) const
const Eigen::Matrix3d &	p2b () const
double	p2b (int i1, int i2) const
dms	sunMeanAnomaly () const
dms	sunMeanLongitude () const
dms	sunTrueAnomaly () const
CachingDms	sunTrueLongitude () const
void	updateValues (long double jd)
double	vEarth (int i) const

Detailed Description

There are several time-dependent values used in position calculations, that are not specific to an object.

This class provides storage for these values, and methods for calculating them for a given date. The numbers include solar data like the true/mean solar anomalies and longitudes, the longitude of the Earth's perihelion, the eccentricity of Earth's orbit, the constant of aberration, the obliquity of the Ecliptic, the effects of Nutation (delta Obliquity and delta Ecliptic longitude), the Julian Day/Century/Millenium, and arrays for computing the precession.

Store several time-dependent astronomical quantities.

Author

Jason Harris

Version

1.0

Definition at line 42 of file ksnumbers.h.

Constructor & Destructor Documentation

KSNumbers()

KSNumbers::KSNumbers ( long double jd )

explicit

Constructor.

Parameters

jd	Julian Day for which the new instance is initialized

Definition at line 93 of file ksnumbers.cpp.

Member Function Documentation

computeConstantValues()

void KSNumbers::computeConstantValues

(

)

compute constant values that need to be computed only once per instance of the application

Definition at line 111 of file ksnumbers.cpp.

constAberr()

dms KSNumbers::constAberr ( ) const

inline

Returns

the constant of aberration (20.49 arcsec).

Definition at line 59 of file ksnumbers.h.

dEcLong()

double KSNumbers::dEcLong ( ) const

inline

Returns

the change in Ecliptic Longitude due to nutation. Value is in degrees.

Definition at line 85 of file ksnumbers.h.

dObliq()

double KSNumbers::dObliq ( ) const

inline

Returns

the change in obliquity due to the nutation of Earth's orbit. Value is in degrees

Definition at line 81 of file ksnumbers.h.

earthEccentricity()

double KSNumbers::earthEccentricity ( ) const

inline

Returns

eccentricity of Earth's orbit.

Definition at line 77 of file ksnumbers.h.

earthPerihelionLongitude()

CachingDms KSNumbers::earthPerihelionLongitude ( ) const

inline

Returns

the longitude of the Earth's perihelion point.

Definition at line 74 of file ksnumbers.h.

getJD()

long double KSNumbers::getJD ( ) const

inline

Returns

the JD for which these values hold (i.e. the last updated JD)

Definition at line 128 of file ksnumbers.h.

julianCenturies()

double KSNumbers::julianCenturies ( ) const

inline

Returns

Julian centuries since J2000

Definition at line 88 of file ksnumbers.h.

julianDay()

long double KSNumbers::julianDay ( ) const

inline

Returns

Julian Day

Definition at line 91 of file ksnumbers.h.

julianMillenia()

double KSNumbers::julianMillenia ( ) const

inline

Returns

Julian Millenia since J2000

Definition at line 94 of file ksnumbers.h.

obliquity()

const CachingDms * KSNumbers::obliquity ( ) const

inline

Returns

the current Obliquity (the angle of inclination between the celestial equator and the ecliptic)

Definition at line 56 of file ksnumbers.h.

p1() [1/2]

const Eigen::Matrix3d & KSNumbers::p1 ( ) const

inline

Definition at line 110 of file ksnumbers.h.

p1() [2/2]

double KSNumbers::p1 ( int i1, int i2 ) const

inline

Returns

element of P1 precession array at position (i1, i2)

Definition at line 97 of file ksnumbers.h.

p1b() [1/2]

const Eigen::Matrix3d & KSNumbers::p1b ( ) const

inline

Definition at line 111 of file ksnumbers.h.

p1b() [2/2]

double KSNumbers::p1b ( int i1, int i2 ) const

inline

Returns

element of P1B precession array at position (i1, i2)

Definition at line 103 of file ksnumbers.h.

p2() [1/2]

const Eigen::Matrix3d & KSNumbers::p2 ( ) const

inline

Returns

the precession matrix directly

Definition at line 109 of file ksnumbers.h.

p2() [2/2]

double KSNumbers::p2 ( int i1, int i2 ) const

inline

Returns

element of P2 precession array at position (i1, i2)

Definition at line 100 of file ksnumbers.h.

p2b() [1/2]

const Eigen::Matrix3d & KSNumbers::p2b ( ) const

inline

Definition at line 112 of file ksnumbers.h.

p2b() [2/2]

double KSNumbers::p2b ( int i1, int i2 ) const

inline

Returns

element of P2B precession array at position (i1, i2)

Definition at line 106 of file ksnumbers.h.

sunMeanAnomaly()

dms KSNumbers::sunMeanAnomaly ( ) const

inline

Returns

the mean solar anomaly.

Definition at line 62 of file ksnumbers.h.

sunMeanLongitude()

dms KSNumbers::sunMeanLongitude ( ) const

inline

Returns

the mean solar longitude.

Definition at line 65 of file ksnumbers.h.

sunTrueAnomaly()

dms KSNumbers::sunTrueAnomaly ( ) const

inline

Returns

the true solar anomaly.

Definition at line 68 of file ksnumbers.h.

sunTrueLongitude()

CachingDms KSNumbers::sunTrueLongitude ( ) const

inline

Returns

the true solar longitude.

Definition at line 71 of file ksnumbers.h.

updateValues()

void KSNumbers::updateValues

(

long double

jd

)

update all values for the date given as an argument.

Parameters

jd	the Julian date for which to compute values

Contributions to the velocity of the Earth referred to the barycenter of the solar system in the J2000 equatorial system Velocities 10^{-8} AU/day Ron & Vondrak method

Definition at line 155 of file ksnumbers.cpp.

vEarth()

double KSNumbers::vEarth ( int i ) const

inline

Definition at line 130 of file ksnumbers.h.

---

The documentation for this class was generated from the following files:

• ksnumbers.h
• ksnumbers.cpp