/*

    A Moon for the Sun

    Release 2.0

    Designed and implemented by John Walker in December 1987,
    revised and updated in February of 1988.

    Make with:

    Adding  appropriate  floating  point  options  to your hardware.  This
    program is a SunView tool which displays, as the  icon  for  a  closed
    window,  the  current phase of the Moon.  A subtitle in the icon gives
    the age of the Moon in days  and  hours.   If  called  with  the  "-t"
    switch,  it  rapidly  increments  forward  through time to display the
    cycle of phases.

    If you open the window, additional information is displayed  regarding
    the  Moon.	 The  information  is  generally  accurate  to	within ten
    minutes.

    The algorithms used in this program to calculate the positions Sun and
    Moon as seen from the Earth are given in the book "Practical Astronomy
    With  Your  Calculator"  by  Peter  Duffett-Smith,   Second   Edition,
    Cambridge University Press, 1981.  Ignore the word "Calculator" in the
    title;  this  is  an  essential  reference  if  you're  interested  in
    developing	software  which  calculates  planetary	positions, orbits,
    eclipses, and  the  like.   If  you're  interested  in  pursuing  such
    programming, you should also obtain:

    "Astronomical  Formulae for Calculators" by Jean Meeus, Third Edition,
    Willmann-Bell, 1985.  A must-have.

    "Planetary  Programs  and  Tables  from  -4000  to  +2800"  by  Pierre
    Bretagnon  and Jean-Louis Simon, Willmann-Bell, 1986.  If you want the
    utmost  (outside  of  JPL)  accuracy  for  the  planets,  it's   here.

    "Celestial BASIC" by Eric Burgess, Revised Edition, Sybex, 1985.  Very
    cookbook oriented, and many of the algorithms are hard to dig  out	of
    the turgid BASIC code, but you'll probably want it anyway.

    Many of these references can be obtained from Willmann-Bell, P.O.  Box
    35025,  Richmond,  VA 23235, USA.  Phone: (804) 320-7016.  In addition
    to their own publications, they stock most of the standard	references
    for mathematical and positional astronomy.

    This program was written by:

       John Walker
       Autodesk, Inc.
       2320 Marinship Way
       Sausalito, CA  94965
       (415) 332-2344 Ext. 829

       Usenet: {sun!well}!acad!kelvin

    This  program is in the public domain: "Do what thou wilt shall be the
    whole of the law".  I'd appreciate  receiving  any  bug  fixes  and/or
    enhancements,  which  I'll  incorporate  in  future  versions  of  the
    program.  Please leave the original attribution information intact	so
    that credit and blame may be properly apportioned.

*/