From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001 From: Joseph Hunkeler Date: Wed, 8 Jul 2015 20:46:52 -0400 Subject: Initial commit --- math/slalib/doc/rverot.hlp | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 math/slalib/doc/rverot.hlp (limited to 'math/slalib/doc/rverot.hlp') diff --git a/math/slalib/doc/rverot.hlp b/math/slalib/doc/rverot.hlp new file mode 100644 index 00000000..5f61abd7 --- /dev/null +++ b/math/slalib/doc/rverot.hlp @@ -0,0 +1,40 @@ +.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 -- cgit