Tag: descriptive

Tag: descriptive

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Epicycle in Ptolemaic Astronomy: Definition &amp

Deferent and epicycle

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“Deferent” redirects here. For the acknowledgement of the legitimacy of the power of one’s superior or superiors, see Deference .
“Epicycle” redirects here. For the similar mathematical curve, see Epicycloid .

In the Hipparchian and Ptolemaic systems of astronomy , the epicycle (from Ancient Greek : ἐπίκυκλος, literally upon the circle, meaning circle moving on another circle [1] ) was a geometric model used to explain the variations in speed and direction of the apparent motion of the Moon , Sun , and planets . In particular it explained the [Continue reading…]

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Anomalous trichromats&#39


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