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The study of celestial objects and phenomena outside of the Earth's atmosphere.
2
votes
Accepted
Comparison of the accuracy of the Ptolemaic and Copernican models
The Ptolemaic and Copernican models are observationally indistinguishable, so the book must be misunderstanding the question or summarising it inaccurately.
15
votes
First to realize that seasons were reversed above and below the equator?
In the Purgatorio (c.1310) Dante places Mount Purgatory at the antipodes of Jerusalem and follows the rules of hard SF by thinking out all the consequences.
Longitude and time zones - this may be the …