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The four faces of the moon are called the Phases of the Moon. They are the New Moon, First Quarter, Full Moon, and Last Quarter.
It is called "first quarter" or "last quarter" when the moon is exactly half-lit.
New moon, first quarter, full moon and third quarter
new moon
Either a First Quarter Moon or a Third Quarter Moon.
A WANING Moon. An increasing Moon is called a waxing Moon. NB From New Moon to first quarter it is a WAXING CRESCENT Moon From 1sr Quarter to Full Moon it is a WAXING GIBBOUS Moon From Full Moon to Last Quarter it is a WANING GIBBOUS Moon From Last Quarter to next New Moon it is a WANING CRESCENT Moon.
its called waning gibbous
The half moon is also called the "first quarter" or "third quarter" moon, depending on its phase. In the first quarter, the right half of the moon is illuminated, while in the third quarter, the left half is lit. This terminology refers to the moon's position in relation to the Earth and the Sun.
When the moon is in the same direction of the sun, it is called a new moon. A week after the new moon, when the moon has completed about a quarter of it's turn around Earth, this is called the first quarter and about three weeks after the new moon and a week after the full moon, it is called the last quarter. If you visualise the moon turning around the Earth and imagine that the direction of which the sun is shining is called the "front' of the Earth, the the quarter moon would be at the 'sides' of the Earth and the full moon is at the 'back'.
The periodic changes in the moon's shape are called phases. The moon goes through different phases as it orbits the Earth, including new moon, first quarter, full moon, and last quarter.
quarter moon
quarter Moon if its half of a sphere then its half moon