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astSetRefPos
-
Set the reference position in a specified celestial coordinate system
- Description:
This function
sets the reference position (see attributes RefRA and RefDec) using
axis values (in radians) supplied within the celestial coordinate
system represented by a supplied SkyFrame.
- Synopsis:
void astSetRefPos( AstSpecFrame *this, AstSkyFrame *frm, double lon,
double lat )
- Parameters:
-
this
-
Pointer to the SpecFrame.
-
frm
-
Pointer to the SkyFrame which defines the celestial coordinate
system in which the longitude and latitude values are supplied.
If NULL
is supplied, then the supplied longitude and latitude values are
assumed to be FK5 J2000 RA and Dec values.
-
lon
-
The longitude of the reference point, in the coordinate system
represented by the supplied SkyFrame (radians).
-
lat
-
The latitude of the reference point, in the coordinate system
represented by the supplied SkyFrame (radians).
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Previous: astSetActiveUnit - Specify how the Unit attribute should be used
AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 211
R.F. Warren-Smith & D.S. Berry
30th April 2003
E-mail:ussc@star.rl.ac.uk
Copyright (C) 2003 Central Laboratory of the Research Councils