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==Origin==
==Origin==
[https://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from [https://nordan.daynal.org/wiki/index.php?title=English#ca._600-1100.09THE_OLD_ENGLISH.2C_OR_ANGLO-SAXON_PERIOD Old English] wanian; akin to Old High German wanōn to wane, Old English wan wanting, deficient, [[Latin]] vanus empty, vain
[https://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from [https://nordan.daynal.org/wiki/index.php?title=English#ca._600-1100.09THE_OLD_ENGLISH.2C_OR_ANGLO-SAXON_PERIOD Old English] wanian; akin to Old High German wanōn to wane, Old English wan wanting, deficient, [[Latin]] vanus empty, vain
*[http://en.wikipedia.org/wiki/12th_century before 12th Century]
*[https://en.wikipedia.org/wiki/12th_century before 12th Century]
==Definitions==
==Definitions==
*1: to decrease in size, extent, or [[degree]] : dwindle: as a : to diminish in [[phase]] or [[intensity]] —used chiefly of the [[moon]], other [[satellites]], and inferior [[planets]]
*1: to decrease in size, extent, or [[degree]] : dwindle: as a : to diminish in [[phase]] or [[intensity]] —used chiefly of the [[moon]], other [[satellites]], and inferior [[planets]]
2: to fall [[gradually]] from [[power]], [[prosperity]], or [[influence]]
2: to fall [[gradually]] from [[power]], [[prosperity]], or [[influence]]
==Description==
==Description==
A lunar [[phase]] or phase of the [[moon]] is the [[appearance]] of the [[illuminated]] (lighted) portion of the [[Moon]] as seen by an [[observer]], usually on [[Earth]]. The lunar phases change [[cyclically]] as the [[Moon]] [[orbits]] the [[Earth]], according to the [[changing]] [[relative]] positions of the [[Earth]], [[Moon]], and [[Sun]]. One half of the lunar [[surface]] is always [[illuminated]] by the [[Sun]] (except during [http://en.wikipedia.org/wiki/Lunar_eclipse lunar eclipses]), and hence is bright, but the portion of the [[illuminated]] hemisphere that is visible to an [[observer]] can vary from 100% ([http://en.wikipedia.org/wiki/Full_moon full moon]) to 0% ([http://en.wikipedia.org/wiki/New_moon new moon]). The boundary between the illuminated and unilluminated hemispheres is called the [http://en.wikipedia.org/wiki/Terminator_(solar) terminator].[http://en.wikipedia.org/wiki/Waning]
A lunar [[phase]] or phase of the [[moon]] is the [[appearance]] of the [[illuminated]] (lighted) portion of the [[Moon]] as seen by an [[observer]], usually on [[Earth]]. The lunar phases change [[cyclically]] as the [[Moon]] [[orbits]] the [[Earth]], according to the [[changing]] [[relative]] positions of the [[Earth]], [[Moon]], and [[Sun]]. One half of the lunar [[surface]] is always [[illuminated]] by the [[Sun]] (except during [https://en.wikipedia.org/wiki/Lunar_eclipse lunar eclipses]), and hence is bright, but the portion of the [[illuminated]] hemisphere that is visible to an [[observer]] can vary from 100% ([https://en.wikipedia.org/wiki/Full_moon full moon]) to 0% ([https://en.wikipedia.org/wiki/New_moon new moon]). The boundary between the illuminated and unilluminated hemispheres is called the [https://en.wikipedia.org/wiki/Terminator_(solar) terminator].[https://en.wikipedia.org/wiki/Waning]
[[Category: Astronomy]]
[[Category: Astronomy]]
[[Category: General Reference]]
[[Category: General Reference]]
