To convert a celestial position in horizon coordinates to the equivalent equatorial coordinates for a given observer's precision, use a command of this form:
az±alt lat lon dt
Azimuth of the object, followed by either
“-” sign and altitude. For the
syntax of these quantities, see Section 4.2, “Specifying angles on command lines”.
Latitude and longitude of the observer; see Section 4.3, “Specifying latitude and longitude on command lines” for their formats.
Date and time of the observation; see Section 4.1, “Specifying dates and times on command lines”.
This example would find the right ascension and declination of a celestial object viewed at an azimuth of 283°16′18″ and an altitude of 19°20′2″, with the observer located at 34°8′42″ N, 107°50′37″ W, on Feb. 29, 2008, at 18:46 Mountain Time.
aard 283d16m18s+19d20m2s 34d08m42sn 107d50m37sw 2008-02-29t18:46mt