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The system of longitude/latitude was developed and is used for the purpose

of locating points on the Earth's surface. Rigel is a star, and its location is

described by means of a similar but separate system of coordinates that

applies to the 'celestial sphere'. Even if you want to talk about the point on

Earth that Rigel is directly over, that point changes about every 30 seconds,

and it sweeps completely around the Earth in a day.

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13y ago

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