"First Quarter" and "Third Quarter"
(Moon half-illuminated.)
Moon Phases , or Lunar Phases.
The moon's phases can be seen from the earth, but not by an observer on the moon. Similarly, the earth's phases can be seen from the moon, but not by an observer on the earth.
That is sometimes what the Moon is called. Seen from Venus the Earth and Moon would be seen as a pair of bright planets up to 0.5 degrees apart at opposition, which is the diameter of the Moon as seen from Earth.
moon phases
Venus
moon phases
mercury
Venus
moon phases
No, each one of the moon's phases appears on a different night.
moon phases
All moon phases look different.