3 years ago

Why do astronomers use the word on to describe angles on the sky rather than angles in the sky?

1 answer:

8 0

The use of the word on instead of the word in when referring to the angular distance between celestial objects comes about because all of the objects appear to be on the celestial sphere and at an indeterminable distance. While we know that objects are at different distances in the sky, their distance from Earth is irrelevant in determining the angular distance between the two objects as viewed from Earth.

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