Calculate the sidereal time (in degrees).
swe_sidtime(jd_ut)
UT Julian day number as double (day)
swe_sidtime returns the sidereal time as double (deg)
swe_sidtime
Determine the sidereal time.
Section 15 in http://www.astro.com/swisseph/swephprg.htm
# NOT RUN { swe_sidtime(2451545) # }
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