Celestial Navigation · The Day's Work — Sun-Run-Sun
A 'sun-run-sun' running fix combines:
- ATwo sun lines taken one minute apart
- BTwo star sights taken at the same instant
- CA Polaris sight and a moon sight
- DA morning sun line advanced to the time of the LAN latitude line (or a later sun line)✓ Correct
Explanation
With only the sun available, the navigator takes a morning sun line, advances it for the run (course and distance) to the time of the noon latitude line or an afternoon sun line, and crosses the two to obtain a running fix — the backbone of a day's celestial work.
Authority: Bowditch (Pub. No. 9), The Day's Work
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