Definition:Hour Circle
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Definition
Let $X$ be the position of a star (or other celestial body) on the celestial sphere.
The hour circle through $X$ is defined as the great circle passing through both $X$ and the celestial poles.
Also see
- Results about hour circles can be found here.
Sources
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): hour circle
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): hour circle