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.help rverot Jun99 "Slalib Package"
.nf
REAL FUNCTION slRVER (PHI, RA, DA, ST)
- - - - - - -
R V E R
- - - - - - -
Velocity component in a given direction due to Earth rotation
(single precision)
Given:
PHI real latitude of observing station (geodetic)
RA,DA real apparent RA,DEC
ST real local apparent sidereal time
PHI, RA, DEC and ST are all in radians.
Result:
Component of Earth rotation in direction RA,DA (km/s)
Sign convention:
The result is +ve when the observatory is receding from the
given point on the sky.
Accuracy:
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
slPVOB.
P.T.Wallace Starlink 20 July 1994
Copyright (C) 1995 Rutherford Appleton Laboratory
Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
.fi
.endhelp
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