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What (who) is lunar cycle - definition
![A crescent Moon over [[Kingman, Arizona]]](https://commons.wikimedia.org/wiki/Special:FilePath/BethinAZ - 10-13.002 (by).jpg?width=200 "A crescent Moon over [[Kingman, Arizona]]")
.jpg?width=200 "200px")
![Earth's orbital plane]]) results in the revolution of the [[lunar nodes]] relative to the Earth. This causes an [[eclipse season]] approximately every six months, in which a [[solar eclipse]] can occur at the [[new moon]] phase and a [[lunar eclipse]] can occur at the [[full moon]] phase.](https://commons.wikimedia.org/wiki/Special:FilePath/Eclipse vs new or full moons, annotated.svg?width=200 "Earth's orbital plane]]) results in the revolution of the [[lunar nodes]] relative to the Earth. This causes an [[eclipse season]] approximately every six months, in which a [[solar eclipse]] can occur at the [[new moon]] phase and a [[lunar eclipse]] can occur at the [[full moon]] phase.")
![overexposed]] photograph of a crescent Moon reveals earthshine and stars.](https://commons.wikimedia.org/wiki/Special:FilePath/Lumiere cendrée (12273290216).jpg?width=200 "overexposed]] photograph of a crescent Moon reveals earthshine and stars.")
.gif?width=200 "Animation showing progression of moon phase.")
![The observed orientation of the Moon at different phases from different latitudes on Earth (the different orientation displayed between the phases at each latitude show merely the extremes of orientation due to [[libration]])](https://commons.wikimedia.org/wiki/Special:FilePath/Moon phases by latitude.svg?width=200 "The observed orientation of the Moon at different phases from different latitudes on Earth (the different orientation displayed between the phases at each latitude show merely the extremes of orientation due to [[libration]])")
![The phases of the Moon as viewed looking southward from the [[Northern Hemisphere]]. Each phase would be rotated 180° if seen looking northward from the [[Southern Hemisphere]]. The upper part of the diagram is not to scale, as the Moon, the Earth, and the Moon's orbit are all much smaller relative to the Earth's orbit than what is shown here.](https://commons.wikimedia.org/wiki/Special:FilePath/Moon phases en.jpg?width=200 "The phases of the Moon as viewed looking southward from the [[Northern Hemisphere]]. Each phase would be rotated 180° if seen looking northward from the [[Southern Hemisphere]]. The upper part of the diagram is not to scale, as the Moon, the Earth, and the Moon's orbit are all much smaller relative to the Earth's orbit than what is shown here.")
![A [[full moon]] sets behind [[San Gorgonio Mountain]] in California on a midsummer's morning.](https://commons.wikimedia.org/wiki/Special:FilePath/Moondrop.jpg?width=200 "A [[full moon]] sets behind [[San Gorgonio Mountain]] in California on a midsummer's morning.")
.jpg?width=200 "Apollo seismometer")
Wikipedia
Concerning the lunar month of approximately 29.53 days as viewed from Earth, the lunar phase or Moon phase is the shape of the Moon's directly sunlit portion, which can be expressed quantitatively using areas or angles, or described qualitatively using the terminology of the four major phases (new moon, first quarter, full moon, last quarter) and four minor phases (waxing crescent, waxing gibbous, waning gibbous, and waning crescent).
The lunar phases gradually change over a synodic month (c. 29.53 days) as the orbital positions of the Moon around Earth, and Earth around the Sun, shift. The visible side of the Moon is variously sunlit, depending on the position of the Moon in its orbit, with the sunlit portion varying from 0% (at new moon) to 100% (at full moon).
Each of the four major lunar phases is approximately 7.4 days±19 hours (6.58–8.24 days), the variation being due to the eccentricity of the Moon's orbit and thus it orbiting at varying speeds.
