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SUNJS2

SUNJS2

Name


      SUNJS2

Purpose


      Computes geocentric physical ephemeris of the sun.

Category


Calling Sequence


      sunjs2, js

Inputs


      js = ephemeris time as Julian Seconds. in
        Delta T = ET - UT which is not completely
        predictable but is about 1 minute now.
        This difference is noticable slightly.

Keyword Parameters


Keywords


        /LIST displays values on screen.
        DIST = distance in AU.
        SD = semidiameter of disk in arc seconds.
        TRUE_LONG = true longitude (deg).
        TRUE_LAT = 0 always.
        APP_LONG = apparent longitude (deg).
        APP_LAT = 0 always.
        J2000_LONG = J2000.0 longitude (deg).
        J2000_LAT = 0 always.
        TRUE_RA = true RA (hours).
        TRUE_DEC = true Dec (deg).
        APP_RA = apparent RA (hours).
        APP_DEC = apparent Dec (deg).
        LAT0 = latitude at center of disk (deg).
        LONG0 = longitude at center of disk (deg).
        PA = position angle of rotation axis (deg).
        CARRINGTON = Carrington rotation number.

Outputs


Common Blocks


Notes


      Notes: based on the book Astronomical Algorithms
        Chapter 24, by Jean Meeus. Good to about 0.01 degree.
        Coefficients based on above reference.
        If no arguments given will prompt and list values.

Modification History


      R. Sterner, 2004 Feb 05
  Copyright (C) 2004, 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.



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