Celestial Navigation · Circle of Position
Every celestial altitude observation actually defines a:
- AStraight rhumb line
- BCircle of equal altitude centered on the body's geographic position✓ Correct
- CGreat circle through the poles
- DMeridian
Explanation
All points at which the body has the same altitude lie on a circle centered on the GP with radius equal to the zenith distance. Near the observer this large circle is approximated by the straight LOP.
Authority: Bowditch (Pub. No. 9), circle of equal altitude
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