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15 Terms
1
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sidereal month
moon reaches the same position with the stars - 27,3 days
2
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synodic month
moon reaches the same position with the sun (sun - moon - earth alignment) - 29,5 days
3
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blue moon
second full moon in the same month
4
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umbra
area of the shadow cone from which the Sun is totally invisible
5
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penumbra
area of the shadow cone from which the Sun is partially visible
6
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sidereal day
earth reaches the same position with the stars - 23h 56min
7
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solar day
earth reaches the same position with the sun - roughly 24 hours
8
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perihelion
earth closest to the sun
9
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aphelion
earth farthest from the sun
10
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15
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Note 
Flashcards (36)