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 `.-./ . Last Quarter +
| @@@@ --`-' 0 23:09:42
|@ @@@ ` New Moon -
| @@ @ 5 19:23:03
\ . @ @@@
| @@ @@@@@
\ @@@@ @\@@
\ o @@ \ \
`\ . .\.-.
\ `-'
`-. o / |
`-. /
`--.
`------
See also: bigcal, globe, xphoon.
ACME Labs / Software / phoon