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 @@@@|
@@@@@@@@@@@@ @@ \ First Quarter +
o @@@@@@@@ @@@@ | 0 7:44:40
. @@ . @@@@@@@ | Full Moon -
.-. @@@ @@@@@@@ | 6 16:05:57
`-' . @@@@ @@@@ o /
@@ . |
. O . o . /
. . /
_ . . .-. /'
`-' /
o O . .-'
. .-'
. .--'
-------'