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GIRAFFE Pipeline Reference Manual |
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Astronomy related Utilities
Detailed DescriptionTBD Function Documentation
Compute the airmass for a given pointing direction and observing site.
The function calculates the average airmass for the line of sight given by the right ascension alpha and the declination delta. The latitude in degrees of the observatory site latitude, and the local sidereal time at observation start lst has to be given, as well as the duration of the observation, i.e. the exposure time exptime. The airmass is computed using the approximations of Young (Young A. T., 1994, "Air mass and refraction", Applied Optics, 33, 1108-1110) and Stetson (Stetson P., 1987, PASP 99, 191). Definition at line 185 of file giastroutils.c. |