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see also:


Aristotle METE


Lucretius DRN

Seneca NQ

References for Greek and Latin

blue: celestial equator as seen for the observer [credit: SMH]
Modern Description

written by Susanne M Hoffmann

The "belt" of a sphere (or geometrically: the great circle) that is exactly in the middle between both poles (or: 90° away from both poles) is called "the equator".

In the image, the blue line is the celestial equator. The orange line is also a great circle but it is tilted and it's distance from the poles differes. In order to make it an equator, we would have to choose different poles.

Further Remarks

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