palRverot
palRverot
- Velocity component in a given direction due to Earth rotation
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)
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.