Celestial Navigation · Navigational Triangle
In the navigational (astronomical) triangle, the three vertices are the elevated pole, the observer's zenith, and the:
- AGeographic position (the body)✓ Correct
- BNadir
- CFirst point of Aries only
- DSub-lunar point only
Explanation
The triangle's vertices are the pole, the zenith, and the body. Its sides are co-latitude, polar distance (co-declination), and zenith distance (co-altitude); solving it yields altitude and azimuth.
Authority: Bowditch (Pub. No. 9), the navigational triangle
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