UNIX & GNU/Linux - Emacs - Phases of the Moon

Yes it really exits!
You can see, with Emacs, the phase of the Moon for the next 12 weeks.

Make an ALT + X and write this:

lunar-phases

Result:

Tuesday, January 4, 2011: New Moon 10:05am (CET)
Wednesday, January 12, 2011: First Quarter Moon 12:33pm (CET)
Wednesday, January 19, 2011: Full Moon 10:19pm (CET)
Wednesday, January 26, 2011: Last Quarter Moon 2:03pm (CET)
Thursday, February 3, 2011: New Moon 3:33am (CET)
Friday, February 11, 2011: First Quarter Moon 8:20am (CET)
Friday, February 18, 2011: Full Moon 9:33am (CET)
Friday, February 25, 2011: Last Quarter Moon 12:32am (CET)
Friday, March 4, 2011: New Moon 9:48pm (CET)
Sunday, March 13, 2011: First Quarter Moon 12:46am (CET)
Saturday, March 19, 2011: Full Moon 7:07pm (CET)
Saturday, March 26, 2011: Last Quarter Moon 1:12pm (CET)

Enjoy!