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 @@@@|
@@@@@@ @@ \ New Moon +
@@@@@ @@@@ | 4 20:34:02
. @@@@@@@ | First Quarter -
@@ @@@@@@@ | 1 18:16:47
@@@ @@@@ o /
@@ . |
. o . /
. . /
. .-. /'
`-' /
O . .-'
. .-'
.--'
----'