Celestial Navigation · Sextant Errors
Perpendicularity error of a sextant is checked and adjusted at the:
- AIndex mirror✓ Correct
- BHorizon glass only
- CMicrometer drum
- DTelescope
Explanation
Perpendicularity error (index mirror not perpendicular to the frame) is checked by viewing the arc's reflection. Side error is at the horizon glass; index error is removed last. These are the adjustable errors.
Authority: Bowditch (Pub. No. 9), sextant adjustable errors
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