moon

full moon; moon on the 15th day of the month (by the lunar calendar)

もちづき only

full moon of the eighth lunar month

new moon; first day of the lunar month

crescent moon

moon's surface

cosmic dual forces; yin and yang; sun and moon, etc.

moon viewing (esp. during the eight month of the lunar calendar)

round face; moon face

vanishing behind the clouds (e.g. of the moon)

vanishing; suddenly disappearing; going into hiding

the Moon

moonlight; moon; moonbeams

Physics

phase (e.g. wave, electricity, moon)

Mathematics

topology

Linguistics

register

autumn moon; harvest moon

on rare occasions; once in a blue moon

Astronomy

Io (moon of Jupiter)

fragment; splinter

wane (of the Moon)

to gaze at the Moon

Astronomy

Charon (moon of Pluto)

Greek mythology

Charon (ferryman of Hades)

Greek mythology

Titan (pre-Olympian god)

Astronomy

Titan (moon of Saturn)

asking for the moon; asking for the impossible; asking for too much; thinking the grass is greener on the other side of the fence

(full) moon; moon when it's round

sixteen-day-old moon

Astronomy

new moon

first day of the lunar month

Historical term

next year's calendar and decrees (in ancient China; distributed by the Emperor at year's end)

water and the Moon

the Moon reflected on the water

solar plexus (as a pressure point in martial arts)

halo (around the Sun, Moon, etc.); ring; corona

Astronomy

waxing and waning (of the Moon)