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Results tagged with astronomy
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user 55
The study of celestial objects and phenomena outside of the Earth's atmosphere.
20
votes
1
answer
4k
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How did Babylonians figure out that the evening star is the morning star?
Hesperus (Roman Vesper) is the name ancient Greeks gave to the evening star that appears in the sky for an hour after the Sun sets. Phosphorus (Roman Lucifer, sic!), was the name of the morning star t …
- 80k
14
votes
3
answers
709
views
What happened in astronomy between Hipparchus and Ptolemy?
Hipparchus applied Apollonius's epicycle/eccenter construction to the motion of the Sun and the Moon, but not to the planets. There are speculations about epicyclic gears for planets in the Antikyther …
- 80k
18
votes
1
answer
598
views
Did Archimedes use epicycles in his planetarium?
Archimedes constructed a planetarium where as described by Cicero "he had thought out a way to represent accurately by a single device for turning the globe those various and divergent movements with …
- 80k
28
votes
2
answers
3k
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What attracted Einstein to the anomalous precession of Mercury?
Einstein's early work seems to be rather distant from astronomy. … Even general relativity was driven by philosophical concerns about general covariance, etc., rather than empirical issues in astronomy. …
- 80k