CL_mod_sidTime — Greenwich mean sideral time (IERS 1996)
[gmst,[gmstp]]=CL_mod_sidTime(cjd_ut1)
It also optionally computes the first derivative of the sideral time : gmstp. (this value is not a constant)
CNES julian date in UT1 time scale(1xN)
greenwich mean sideral time [rad]
greenwich mean sideral time first derivative [rad/s]
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)