WR 134, Cygnus

SONY HF90

Any explanation here? 🤔

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M78, Within Orion

Occultations by the Moon

The term occultation is most frequently used to describe lunar occultations, 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 μrad/s, has a very thin atmosphere and stars have an angular diameter of at most 0.057 arcseconds or 0.28 μrad, 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. Events that take place on the Moon's dark limb are of particular interest to observers, because the lack of glare allows easier observation and timing.

The accurate timing of lunar occultations is performed regularly by (primarily amateur) astronomers. Lunar occultations timed to an accuracy of a few tenths of a second have various scientific uses, particularly in refining our knowledge of lunar topography. 

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image credit: Tom Fleming, Elias Chasioti, Delberson Souza, Bob Schiff, Fausto Lubatti, Sergio Scauso

The chosen one

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My moon eating sunlight. So adorable 🥰

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What a distinguished gentleman

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What to do if both ears itch at once...

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IBM PS/1 Model 2121 (1992)

Comet Pons-Brooks by Petr Horálek

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1956 Maserati 300S.

Large Magellanic Cloud