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### Buie

 Title
 Description
ACRE Automatic Cosmic Ray Extraction
ADDNCCAL Add calibration frames for entries in the nasacam calib data base
ADDSLASH Append a trailing / to string (if needed).
AIRINDEX This function is based on the formulas in Filippenko, PASP, v. 94, pp. 715-721 for the index of refraction of air. The conversion from relative humidity to vapor pressure is from the Handbook of Chemistry and Physics.
AIRMASS This is should be a pretty good function for computing the air mass factor. The default is to use the cosine based formula derived by David Tholen but the older secant based formula from Hardie is still available. The zenith angle is ...
ALTAZ
ALTOHA
ANGSEP Compute the angular distance between two spherical coordinates.
APPULDIS Given the ephemeris The approximate time of the appulse must be within +/-30 minutes or this will fail.
AST2TED Convert astrometry file to a Ted Bowell format astrometry file.
ASTANAL
ASTCHI1
ASTCOL Collect astrometry observations for multiple objects
ASTCVT
ASTEVAL Evaulate an astrometric polynomial function.
ASTINFO
ASTRD2SN Astrometry conversion from ($\alpha$,$\delta$) to ($\xi$,$\eta$)