Celestial Navigation · Coordinates
The geographic position (GP) of a celestial body is the point on Earth where the body is:
- AOn the horizon
- BDirectly overhead (at the zenith)✓ Correct
- CSetting
- DAt lower transit
Explanation
The GP is the spot where a line from the body to Earth's center pierces the surface — the body is directly overhead there. Its latitude equals the body's declination and its longitude corresponds to the GHA.
Authority: Bowditch (Pub. No. 9), celestial coordinates
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