Difference between revisions of "Waning"
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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 | ||
| − | *[ | + | *[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]] | ||
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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 [ | + | 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]] | ||
Latest revision as of 02:42, 13 December 2020
Origin
Middle English, from Old English wanian; akin to Old High German wanōn to wane, Old English wan wanting, deficient, Latin vanus empty, vain
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
2: to fall gradually from power, prosperity, or influence
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 lunar eclipses), and hence is bright, but the portion of the illuminated hemisphere that is visible to an observer can vary from 100% (full moon) to 0% (new moon). The boundary between the illuminated and unilluminated hemispheres is called the terminator.[1]
