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» Online Classroom   » Celestial Navigation   » Public Discussion of Cel Nav   » taking sights

   
Author Topic: taking sights
tarajose


 - posted December 23, 2019 08:41 AM      Profile for tarajose           Edit/Delete Post 
Hello
in final adjustment in taking sun sight which way do you turn Vernier? set at 0 correct? go clockwise?thanks Joe

Capt Steve Miller


 - posted December 23, 2019 10:06 AM      Profile for Capt Steve Miller           Edit/Delete Post 
You would turn the drum in the direction necessary to keep the SUN in position tangent to the horizon. Then any subsequent adjustments would be in the same direction. If you were to turn the drum in the opposite direction, for subsequent adjustments, you risk moving the worm teeth to the other side of contact due to the gap in the teeth (a manufacturing consequence). This can throw an error into your sextant reading.
From: Starpath


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