"First Quarter" and "Third Quarter"
(Moon half-illuminated.)
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.
The different shapes of the moon seen from Earth are called lunar phases. These phases include new moon, first quarter, full moon, and last quarter, which result from the changing positions of the moon, Earth, and the sun.
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.
The changing views of the moon as seen from Earth are called moon phases. These phases result from the relative positions of the sun, Earth, and moon, causing different portions of the moon to be illuminated.
Venus
moon phases
mercury
Venus
No, each one of the moon's phases appears on a different night.
moon phases
The changing views of the moon as seen from Earth are due to its phases, which are a result of the changing positions of the moon, Earth, and sun. The moon goes through a cycle of phases, including new moon, crescent, first quarter, gibbous, full moon, gibbous, last quarter, and crescent, as it orbits Earth. These phases are the result of the varying amounts of sunlight that illuminate different parts of the moon's surface as seen from Earth.
Phases of the moon as seen in the Southern HemisphereThe images below show the different phases of the moon in one Lunar month for the Northern HemisphereSsunWaning crescentLast quarter(Half Moon)Waning gibbousDay 25Day 21Day 17The Moon is 90 degrees west of the sunNew MoonDay 0The angular distance of the sun and moon is small, less than a few degrees.Full MoonDay 14The moon is 180 degrees from the sun.1Day 3Day 7Day 10Waxing crescentFirst quarteror Half MoonWaxing gibbousThe Moon is 90 degrees east of the Sun