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doit_the_clown doit_the_clown
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Why is the Earth’s tropical year (the time from one vernal equinox to the next) not the same length as its sidereal year (the time needed for the Earth to orbit around the Sun once relative to the distant stars)?

(a)   The direction of tilt of the Earth’s rotation axis is changing.
(b)   The Earth’s sidereal year is not precisely 325.25 days long.
(c)   The length of the Earth’s day is changing.
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Discovering the Universe

Discovering the Universe


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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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doit_the_clown Author
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8 years ago
Thanks for your help!!
patyfeitosa
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Thank you, thank you, thank you!
Zacellison
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2 hours ago
this is exactly what I needed
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