NAME: YMD2JD PURPOSE: From Year, Month, and Day compute Julian Day number. CATEGORY: CALLING SEQUENCE: jd = ymd2jd(y,m,d) INPUTS: y = Year (like 1987). in m = month (like 7 for July). in d = month day (like 23). in KEYWORD PARAMETERS: OUTPUTS: jd = Julian Day number (like 2447000). out COMMON BLOCKS: NOTES: MODIFICATION HISTORY: R. Sterner, 23 June, 1985 --- converted from FORTRAN. Johns Hopkins University Applied Physics Laboratory. RES 18 Sep, 1989 --- converted to SUN R. Sterner, 2010 Aug 12 --- Added reference and example. Copyright (C) 1985, Johns Hopkins University/Applied Physics Laboratory This software may be used, copied, or redistributed as long as it is not sold and this copyright notice is reproduced on each copy made. This routine is provided as is without any express or implied warranties whatsoever. Other limitations apply as described in the file disclaimer.txt.