Phoon displays the phase of the moon, either currently or at a specified date / time. Unlike other such programs, which just tell you how long since first quarter or something like that, phoon shows you the phase with a cute little picture. You can vary the size of the picture with the -l flag, but only some sizes have pictures defined - other sizes use @'s.
Sample output (HTMLized via texttohtml):
.--------
.--' o . .
.-' . O .
.-'@ @@@@@@@ . @@@
/@@@ @@@@@@@@@@@ @@@@
./ o @@@@@@@@@@@ @@@@@
/@@ o @@@@@@@@@@@. @@@@
/@@@@ . @@@@@@@o @@@@@
|@@@@@ . @@@@@@@
/@@@@@ O `.-./ . @@@@@@ Full Moon +
| @@@@ --`-' o @@@ 5 22:23:26
|@ @@@ ` o . @@ Last Quarter -
| @@ @ .-. @ 1 13:13:16
\ . @ @@@ `-' . @
| @@ @@@@@ .
\ @@@@ @\@@ / . O
\ o @@ \ \ /
`\ . .\.-.___ .
\ `-'
`-. o / | o
`-. / .
`--. .
`--------
See also: bigcal, globe, xphoon.
ACME Labs / Software / phoon