An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Sodium Moon Spot (SMS)
  لکه‌ی ِ سودیومی ِ مانگ  
lake-ye sodiomi-ye Mâng
Fr.: tache de sodium de la Lune  

The → sodium tail of the Moon as it appears in the sky opposite the Sun. The SMS undergoes changes in shape and brightness. It is brighter when the → new moon occurs at → perigee, when the new moon is north of the → ecliptic, and approximately five hours after the new moon.

See also: → sodium; → Moon; → spot.