Questions tagged [ptolemy]

Ptolemy was an astronomer, mathematician, and geographer of Greek descent who flourished in Alexandria during the 2nd century CE.

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Has anyone explored Ptolemy's epicycles as an early form of Fourier analysis?

Whilst researching science in the ancient world, I came across an observation, which unfortunately I did not make a note of, and so cannot credit, that Ptolemy's epicycles were an early form of ...
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Did Ptolemy and other Greek scientists actually measure the distance to the Sun?

According to Subhash C. Kak: Early Theories on the Distance to the Sun: “Pancavimsa Brahmana states that the heavens are 1000 earth diameters, de, away from the earth. The sun was also taken to be ...
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How did Ptolemy calculate the distance to the moon?

I've read somewhere that Hipparchus measured the distance to the Moon using the lunar and solar eclipse and obtained a value of around 67.3 Earth radii. It also says that soon after Ptolemy gave a ...
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What is Ptolemy holding in his picture on Wikipedia?

I would like to know the name of the device Ptolemy is holding in his picture