siderealTime: Convert From POSIXt Time to Sidereal Time
Description
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.
Usage
siderealTime(t)
Value
A sidereal time, in hours in the range from 0 to 24.
Arguments
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.
Author
Dan Kelley
References
Meeus, Jean. Astronomical Formulas for Calculators. Second Edition.
Richmond, Virginia, USA: Willmann-Bell, 1982.
See Also
Other things related to astronomy:
angle2hms(),
eclipticalToEquatorial(),
equatorialToLocalHorizontal(),
julianCenturyAnomaly(),
julianDay(),
moonAngle(),
sunAngle(),
sunDeclinationRightAscension()