SolarPosition.cpp File Reference

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Detailed Description

Compute solar and lunar positions with a simple algorithm.

Definition in file SolarPosition.cpp.

#include "DayTime.hpp"
#include "Position.hpp"
#include "icd_200_constants.hpp"
#include "geometry.hpp"
#include "SolarPosition.hpp"

Include dependency graph for SolarPosition.cpp:

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Namespaces
namespace	gpstk
Functions
Position	SolarPosition (DayTime t, double &AR) throw ()
	Compute the Position of the Sun in WGS84 ECEF coordinates.
void	CrudeSolarPosition (DayTime t, double &lat, double &lon) throw ()
	Compute the latitude and longitude of the Sun using a very simple algorithm.
double	shadowFactor (double Rearth, double Rsun, double dES) throw ()
	Compute the fraction of the area of the Sun covered by the Earth as seen from another body (e.g.
Position	LunarPosition (DayTime t, double &AR) throw ()
	Compute the Position of the Moon in WGS84 ECEF coordinates.

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Function Documentation

void CrudeSolarPosition (  DayTime  t, double &  lat, double &  lon )  throw ()

Compute the latitude and longitude of the Sun using a very simple algorithm. Adapted from sunpos by D. Coco ARL:UT 12/15/94 Parameters: DayTime  t Input epoch of interest double  lat Output latitude of the Sun at t double  lon Output longitude of the Sun at t Definition at line 123 of file SolarPosition.cpp. References gpstk::atan(), gpstk::sin(), gpstk::sqrt(), and TWO_PI.

Position LunarPosition (  DayTime  t, double &  AR )  throw ()

Compute the Position of the Moon in WGS84 ECEF coordinates. Ref. Astronomical Almanac 1990 D46 Parameters: DayTime  t Input epoch of interest double  AR Output apparent angular radius of moon as seen at Earth (deg) Returns: Position Position (ECEF) of the Moon at t Definition at line 199 of file SolarPosition.cpp. References gpstk::cos(), Position::setECEF(), and gpstk::sin().

double shadowFactor (  double  Rearth, double  Rsun, double  dES )  throw ()

Compute the fraction of the area of the Sun covered by the Earth as seen from another body (e.g. satellite). Parameters: double  Rearth Apparent angular radius of Earth. double  Rsun Apparent angular radius of Sun. double  dES Angular separation of Sun and Earth. Returns: double factor Fraction (0 <= factor <= 1) of Sun area covered by Earth Definition at line 180 of file SolarPosition.cpp. References gpstk::beta().

Position SolarPosition (  DayTime  t, double &  AR )  throw ()

Compute the Position of the Sun in WGS84 ECEF coordinates. Ref. Astronomical Almanac pg C24, as presented on USNO web site; claimed accuracy is about 1 arcminute, when t is within 2 centuries of 2000. Parameters: DayTime  t Input epoch of interest double  AR Output apparent angular radius of sun as seen at Earth (deg) Returns: Position Position (ECEF) of the Sun at t Definition at line 67 of file SolarPosition.cpp. References gpstk::asin(), gpstk::cos(), Position::setECEF(), and gpstk::sin(). Referenced by gpstk::doSatAtt().

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