Description:
Calculate
the velocity component in a given direction due to Earth rotation.
The simple algorithm used assumes a spherical Earth, of a radius chosen to give results accurate to
about 0.0005 km/s for observing stations at typical latitudes and heights. For applications requiring
greater precision, use the routine palPvobs.
Invocation
double palRverot ( double phi, double
ra, double da, double st );
Arguments
phi = double (Given)
latitude of observing station
(geodetic) (radians)
ra = double (Given)
apparent RA (radians)
da = double (Given)
apparent
Dec (radians)
st = double (Given)
Local apparent sidereal time.
Returned Value
palRverot = double
Component of Earth rotation in direction RA,DA (km/s). The result is
ve
when the observatory is receding from the given point on the sky.
Copyright © 2012 Science and Technology Facilities Council.
Copyright © 2014 Cornell University.
Copyright © 2015 Tim Jenness