NAME:
  lcltoeq
 PURPOSE:   (one line only)
  Convert from local horizon coordinates to equatorial coordinates
 DESCRIPTION:
 CATEGORY:
  Astronomy
 CALLING SEQUENCE:
  lcltoeq,alt,az,lat,ha,dec
 INPUTS:
  alt  - Altitude above horizon (radians)
  az   - Azimuth (radians)
  lat  - Latitude of viewpoint (radians)
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
 OUTPUTS:
  ha   - Local hour angle relative to the prime meridian (radians)
  dec  - Declination of position (radians)
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  2010/07/02, Written by Marc W. Buie, Southwest Research Institute.  Ported
                from lcltoeq.c in my C-library.