NAME: obsnight PURPOSE: (one line only) Determine general details of a given night determined by Sun and Moon DESCRIPTION: CATEGORY: Astronomy CALLING SEQUENCE: obsnight,jd,obs,night INPUTS: jd - Julian date for a time near midnight, string or double obs - Observatory information, either an integer, string, or structure OPTIONAL INPUT PARAMETERS: KEYWORD INPUT PARAMETERS: OUTPUTS: night - anonymous structure with information about the night KEYWORD OUTPUT PARAMETERS: COMMON BLOCKS: SIDE EFFECTS: RESTRICTIONS: PROCEDURE: MODIFICATION HISTORY: 2016/02/05, Written by Marc W. Buie, Southwest Research Institute