Convert a POSIXt time to a sidereal time, using the method in Chapter 7 of reference 1. The small correction that he discusses after his equation 7.1 is not applied here.
siderealTime(t)a time, in POSIXt format, e.g. as created by
as.POSIXct(), as.POSIXlt(), or
numberAsPOSIXct(). If this is provided, the other arguments are
ignored.
A sidereal time, in hours in the range from 0 to 24.
Meeus, Jean. Astronomical Formulas for Calculators. Second Edition. Richmond, Virginia, USA: Willmann-Bell, 1982.
Other things related to astronomy:
angle2hms(),
eclipticalToEquatorial(),
equatorialToLocalHorizontal(),
julianCenturyAnomaly(),
julianDay(),
moonAngle(),
sunAngle(),
sunDeclinationRightAscension()
t <- ISOdatetime(1978, 11, 13, 0, 0, 0, tz = "UTC")
print(siderealTime(t))
#> [1] 3.45037