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Lambda Geminorum Occultation by the Moon , 29 November 2015.Ł

The term occultation is most frequently used to describe those relatively frequent occasions when the Moon passes in front of a star during the course of its orbital motion around the Earth. Since the Moon, with an angular speed with respect to the stars of 0.55 arcsec/s or 2.7 Árad/s, has a very thin atmosphere and stars have an angular diameter of at most 0.057 arcseconds or 0.28 Árad, a star that is occulted by the Moon will disappear or reappear in 0.1 seconds or less on the Moon's edge, or limb.

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