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» Online Classroom   » Celestial Navigation   » Public Discussion of Cel Nav   » Hawaii By Sextant: Special Problem #3

   
Author Topic: Hawaii By Sextant: Special Problem #3
Ian


 - posted April 09, 2020 01:21 PM      Profile for Ian           Edit/Delete Post 
Hello!

The time listed for the twilight on 7 JUL 82 is 22 13, which was not like any time I computed. I estimated that the DR location would be something like 41N and 131 30W.

I did notice It is approximately 1/2 between Civil and Nautical twilight -- is that how it was computed?

For the times I did compute I got the following:

GMT Sunset at 45N 135W: 19 49
GMT Sunset at 40N 135W: 19 32
Adjustment to 41N: 3.4m
GMT Sunset at 41N 135W: 19 35

Adjustment to 131 30W -14m
GMT Sunset at 41N 131 30W: 19 21

Watch TIme: +2h
WT Sunset: 21 21

GMT Civil at 45N 135W: 20 25
GMT Civil at 40N 135W: 20 04
Adjustment to 41N: 4.2m
GMT Civil at 41N 135W: 20 08

Adjustment to 131 30W -14m
GMT Civil at 41N 131 30W: 19 54

Watch TIme: +2h
WT Civil: 21 54

GMT Nautical at 45N 135W: 21 21
GMT Nautical at 40N 135W: 20 45
Adjustment to 41N: 5.8
GMT Nautical at 41N 135W: 20 51

Adjustment to 131 30W -14m
GMT Nautical at 41N 131 30W: 20 37

Watch TIme: +2h
WT Nautical: 22 37

Was my approach off, or did I make a miscalculation?

Thanks!

From: San Diego, CA
David Burch


 - posted April 09, 2020 01:31 PM      Profile for David Burch           Edit/Delete Post 
Does your answer agree with what is in book? if not, what is difference you find?
From: Starpath, Seattle, WA


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