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How Greeks proved that solar parallax is negligible?

The primary concern of the questioner is whether and how the ancient Greeks, particularly Hipparchus, understood that the Sun is far away and that sunlight reaches us in nearly parallel rays, leading ...
eshaya's user avatar
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2 votes
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A planet after a moon-generating impact

[OP] Nascent terrestrial planets quickly have their surfaces cool down. Formation of crust then yields formation of a figure to fossilise. [OP, emphasis added] An answer to this question is defined by ...
doubleunary's user avatar
2 votes

Eclipse Saros Cycle vs Nodal Precession Cycle

Attempting to answer my own question, here's what seems to be happening: Since a Saros is slightly shorter than 18.6 years (the lunar nodes period of rotation), after 1 Saros cycle the nodes will be ...
lemonsqueeze's user avatar
4 votes

Does the Moon really go around the Earth?

The two body problem trajectory of the Earth and the Moon can equally well be approximated by the Moon orbiting the Earth in an ellipse with the Earth at one of the foci. Interestingly, the two body ...
David Hammen's user avatar
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