/afs/in2p3.fr/throng/virgo/virgoDev/SoftFlorent/GWOLLUM/v2r2/src/Time/Date.h File Reference

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include "LeapSeconds.h"

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Defines
#define	EPOCH_GPS_TAI_UTC   19
	Leap seconds (TAI-UTC) on the GPS epoch (1980 JAN 6 0h UTC).
#define	EPOCH_J2000_0_JD   2451545.0
	Julian Day of the J2000.0 epoch (2000 JAN 1 12h UTC).
#define	EPOCH_UNIX_GPS   315964800
#define	M_PI   3.14159265358979323846
Functions
struct tm *	GPSToUTC (struct tm *utc, int gpssec)
double	GreenwichMeanSiderealTime (const double gpstime)
	Convenience wrapper, calling GreenwichSiderealTime() with the equation of equinoxes set to 0.
double	GreenwichSiderealTime (const double gpstime, double equation_of_equinoxes)
	Returns the Greenwich Sidereal Time IN RADIANS corresponding to a specified GPS time.
double	JulianDay (const struct tm *utc)
	Returns the Julian Day (JD) corresponding to the date given in a broken down time structure.
int	LeapSeconds (int gpssec)
	Returns the leap seconds TAI-UTC at a given GPS second.
int	LeapSecondsUTC (const struct tm *utc)
int	UTCToGPS (const struct tm *utc)

---

Define Documentation

#define EPOCH_GPS_TAI_UTC   19

Leap seconds (TAI-UTC) on the GPS epoch (1980 JAN 6 0h UTC).

#define EPOCH_J2000_0_JD   2451545.0

Julian Day of the J2000.0 epoch (2000 JAN 1 12h UTC).

#define EPOCH_UNIX_GPS   315964800

#define M_PI   3.14159265358979323846

---

Function Documentation

struct tm* GPSToUTC	(	struct tm *	utc,
		int	gpssec
	)			[read]

double GreenwichMeanSiderealTime

(

const double

gpstime

)

Convenience wrapper, calling GreenwichSiderealTime() with the equation of equinoxes set to 0.

double GreenwichSiderealTime	(	const double	gpstime,
		double	equation_of_equinoxes
	)

Returns the Greenwich Sidereal Time IN RADIANS corresponding to a specified GPS time.

Aparent sidereal time is computed by providing the equation of equinoxes in units of seconds. For mean sidereal time, set this parameter to 0.

This function returns the sidereal time in radians measured from the Julian epoch (current J2000). The result is NOT modulo 2 pi.

Inspired by the function sidereal_time() in the NOVAS-C library, version 2.0.1, which is dated December 10th, 1999, and carries the following references:

Aoki, et al. (1982) Astronomy and Astrophysics 105, 359-361. Kaplan, G. H. "NOVAS: Naval Observatory Vector Astrometry Subroutines"; USNO internal document dated 20 Oct 1988; revised 15 Mar 1990.

See http://aa.usno.navy.mil/software/novas for more information.

double JulianDay

(

const struct tm *

utc

)

Returns the Julian Day (JD) corresponding to the date given in a broken down time structure.

Parameters:

[in]

utc

UTC time in a broken down time structure.

int LeapSeconds

(

int

gpssec

)

Returns the leap seconds TAI-UTC at a given GPS second.

Parameters:

[in]

gpssec

Seconds relative to GPS epoch.

int LeapSecondsUTC

(

const struct tm *

utc

)

int UTCToGPS

(

const struct tm *

utc

)