Celestial Navigation · Navigational Triangle
Zenith distance is equal to:
- A90° minus the observed altitude (Ho)✓ Correct
- BThe observed altitude plus declination
- C90° plus the observed altitude
- DThe latitude minus the declination
Explanation
Zenith distance (the side of the navigational triangle from the zenith to the body) equals 90° − Ho. It is the angular distance from the observer's zenith to the body and the radius of the circle of equal altitude.
Authority: Bowditch (Pub. No. 9)
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