Next / Previous / Contents / Shipman's homepage

12.2. AltAZ.raDec(): Convert horizon to equatorial coordinates

This method performs one of the fundamental astronomical calculations: converting a position in the sky expressed in horizon coordinates to the corresponding position in equatorial coordinates.

To do this conversion, we must know the time and place. For an AltAZ instance AA, this method returns a position in equatorial coordinates as a RADec instance.

AA.raDec(lst, latLon)
lst

The local sidereal time at the observer's location, as a SiderealTime instance.

latLon

The observer's terrestrial position, as a LatLon instance.