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):
. . . -. \ \. \ \ | \ New Moon + | 0 23:33:04 | First Quarter - | 7 4:26:12 / | / / /' / -' ' ' '
See also: bigcal, globe, xphoon.
ACME Labs / Software / phoon