Celestial Navigation · Sextant Corrections
The dip correction for height of eye is:
- AAlways added
- BAdded for the Sun, subtracted for stars
- CAlways subtracted✓ Correct
- DIgnored below 10 meters height of eye
Explanation
Dip arises because the observer is elevated above sea level, lowering the visible horizon; it is ALWAYS subtracted, and it increases with height of eye (dip ≈ 0.97 × √height in feet).
Authority: Nautical Almanac
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