Daydream

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Vale do Mucuri, nordeste de Minas Gerais, antes da desativação Ferrovia Bahia-Minas .

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      pusheen gifs ݂ ༷ ּ,

     ⓘ dm for credit / removal

   ♡  resource : Pinterest

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vintage stamps

[publicdomainreview]

“Plate XXXI, which you may if you please, call a partial View of Immensity, or without much Impropriety perhaps, a finite View of Infinity”.⠀ ⠀ More from Thomas Wright’s An Original Theory or New Hypothesis of the Universe (1750) here: https://publicdomainreview.org/collection/an-original-theory-or-new-hypothesis-of-the-universe

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Merry Christmas, everyone!

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[wonders-of-the-cosmos]

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. 

source

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

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artist: felicia chiao

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[ai-dream]

Pinkcore.

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Núcleo rosado

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🩷

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