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Celestial sphere: Quiz


Question 1: In astronomy and navigation, the celestial sphere is an imaginary sphere of arbitrarily large radius, concentric with the ________ and rotating upon the same axis.

Question 2: In the Aristotelic and Ptolemaic models, the celestial sphere was imagined as a physical reality rather than a geometrical projection (see ________).
Greek astronomyHeliocentrismGeocentric modelCelestial spheres

Question 3: Projected upward from Earth's ________ and poles are the celestial equator and the celestial poles.
1st parallel southEquator1st parallel north5th parallel north

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