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xphoon(1)							     xphoon(1)

NAME
       xphoon - displays the PHase of the mOON on the root window

SYNOPSIS
       xphoon [-b] [-t interval [-i]] [-s] [-display name]

DESCRIPTION
       Xphoon  sets  the X root window to a picture of the moon in its current
       phase, including the partial lighting of the  dark  side	 by  reflected
       earthlight.

OPTIONS
       -b     Defeats  the  earthlight	feature,  forcing  the dark side to be
	      black.

       -t     Have xphoon keep running and update the picture  every  interval
	      minutes.	 (Normally,  xphoon  just  sets	 the  root picture and
	      exits.)

       -i     Forks a background process and prints the process-id to  stdout.
	      Useful  if  you  want  to	 make menu commands to refresh or kill
	      xphoon.

       -s     Rotate the whole picture 180 degrees, resulting in a  moon  pic‐
	      ture as viewed fom the Southern hemisphere.

       -demo  Demonstrate xphoon by rapidly stepping through moon phases.

NOTES
       The  original  motivation  for  this  program was that xsetroot was too
       slow.  Loading a full-screen bitmap took about 15 seconds.  We  made  a
       trivial	program	 that  had  fullmoon.bitmap compiled in, and it ran in
       less than a second.  (And incidentally, the executable was smaller than
       fullmoon.xbm.)	Then  later  we	 came  up  with the phase hacking, the
       earthlight, and the auto-scaling.

SEE ALSO
       phoon(1), xsetroot(1)

AUTHORS
       Copyright (C) 1988, 1991 by Jef Poskanzer and Craig Leres.

       The moon-phase computation is from "moontool.c" by John Walker.

				 6 April 1999			     xphoon(1)

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