Celestial Navigation · Running Fix
When only the Sun is available during the day, a fix is commonly obtained by:
- ATwo simultaneous Sun sights
- BA morning Sun line advanced to a noon latitude or afternoon line (a running fix)✓ Correct
- CA single sight
- DObserving Polaris at noon
Explanation
With one body, a morning Sun line is advanced along the course and speed to cross a later Sun line (often the noon latitude line), giving a running fix. The classic day's work strings these together.
Authority: Bowditch (Pub. No. 9), the day's work; running fix
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