Celestial Navigation · Navigational Triangle
The three vertices of the navigational (astronomical) triangle are:
- AThe geographic position, the dead-reckoning position, and the fix
- BThe north pole, the south pole, and the equator
- CThe observer, the Sun, and the Moon
- DThe elevated pole, the observer's zenith, and the celestial body✓ Correct
Explanation
The navigational triangle is formed on the celestial sphere by the elevated pole, the observer's zenith, and the body. Its sides are co-latitude, polar distance (co-declination), and zenith distance (co-altitude); solving it yields computed altitude and azimuth.
Authority: Bowditch (Pub. No. 9)
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