Celestial Navigation · Running Fix
In a celestial running fix using two Sun sights taken hours apart, the earlier LOP is:
- AAdvanced along the course and distance run to the time of the second sight✓ Correct
- BDiscarded as too old to use
- CRotated 90° before crossing
- DAveraged with the second LOP to get a single line
Explanation
As with a coastal running fix, the earlier LOP is advanced for the vessel's course and distance run between sights, then crossed with the later LOP. A common pairing is a morning Sun line advanced to cross the latitude obtained at LAN.
Authority: Bowditch (Pub. No. 9)
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