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There are four principal (primary, or major) lunar phases: the new moon, first quarter, full moon, and last quarter (also known as third or final quarter), when the Moon's ecliptic longitude is at an angle to the Sun (as viewed from the center of the Earth) of 0°, 90°, 180°, and 270° respectively.
Learn how the Moon changes its shape and position in the sky over a lunar month. Find out when the next First Quarter Moon is and what it looks like from different hemispheres.
Learn how the Moon's orbit and rotation create the first quarter phase, when you see half of its illuminated side. Find out when and how to observe the Moon each day of the year with NASA's interactive map.
6. Mai 2024 · Learn about the eight phases of the Moon, or shapes, that we see each month as the Moon orbits Earth. The first quarter phase is when we see a half moon on the left side.
30. Aug. 2023 · Learn how the Moon's phases are caused by the Sun, Earth, and the Moon's orbit. Find out how the Moon's phases relate to lunar and solar eclipses and when to see them.
25. Apr. 2023 · Learn how the Moon's shape changes over a period of about 30 days due to the positions of the Sun, Earth, and the Moon. Find out when the next full moon is and what are the names and meanings of the main Moon phases.
4. Okt. 2017 · Learn how the Moon's orbit and rotation create different phases, such as quarter moon, that we see from Earth. See a chart and a simulation of the Moon's appearance throughout 2018.
