NAME:
    year2jd
 PURPOSE: (one line)
    Convert decimal year to Julian date (reverse of jd2year).
 DESCRIPTION:

 CATEGORY:
    Astronomy
 CALLING SEQUENCE:
    year2jd, year, jd
 INPUTS:
    year   : Decimal year
 OPTIONAL INPUT PARAMETERS:

 KEYWORD PARAMETERS:

 OUTPUTS:
    jd     : Julian Date (double precision ONLY)
 COMMON BLOCKS:

 SIDE EFFECTS:

 RESTRICTIONS:

 PROCEDURE:

 MODIFICATION HISTORY:
    Written by Marc Buie, Lowell Observatory, 2008/02/03