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CelestLab >> Models > CL_mod_sidTime

CL_mod_sidTime

Greenwich mean sideral time (IERS 1996)

Calling Sequence

[gmst,[gmstp]]=CL_mod_sidTime(cjd_ut1)

Description

Parameters

cjd_ut1:

Modified (1950.0) Julian day, in UT1 time scale (1xN)

gmst :

Greenwich mean sideral time [rad]

gmstp :

Greenwich mean sideral time first derivative [rad/s]

Authors

Bibliography

See also

Examples

cjd_utc = CL_dat_cal2cjd(2008,10,25,15,30,25)  // 25 oct 2008 at 15h30min25s
sec_ut1_minus_utc = 0.2;
cjd_ut1 = cjd_utc + sec_ut1_minus_utc/86400.;  // ut1 time
gmst = CL_mod_sidTime(cjd_ut1);
[gmst,gmstp] = CL_mod_sidTime(cjd_ut1);

// With first time derivative :
[gmst,gmstp] = CL_mod_sidTime(21915.121212)
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