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» Online Classroom   » Celestial Navigation   » Public Discussion of Cel Nav   » Chapter 5 questions

   
Author Topic: Chapter 5 questions
Tim


 - posted November 08, 2006 03:13 PM      Profile for Tim           Edit/Delete Post 
Hi,

I completed the questions at the end of chapter 5 and seem to have some answers that are somewhat different from the answers in the back of the book. I am having some issues interpreting the conversion of East Longitudes in figuring GHA/LHA, but it would seem that I am getting the correct result. My problem seems to be in figuring “a”, I have rerun the problems several times and cannot seem get the math right. I would appreciate it if someone could look at my answers below and give me some insight as to what I am doing wrong.

Thank you,
Tim Walsh

5.7.1
Ho = 54º 15.4’
Hs = 53º 34.4’

a = 41’ T
Zn = 180º
a-Lat = 56ºN
a-Lon = 164º 23.3’W

Lat = 55º 19.0’N

5.7.2
Ho = 86º 55.8’
Hs = 87º 05.5’

a = 9.7’ A
Zn = 180º
a-Lat = 10ºS
a-Lon = 166º16.6’W

LAT = 09º 50.3’S

5.7.3
Ho = 41º 45.8'
Hs = 42º 00.2'

a = 14.4' A
ZN = 180º
a-Lat = 36ºN
a-Lon = 075º 57.5E

Lat = 36º 14.4'N

5.7.4
Ho = 54º 55.4'
Hs = 54º 41.4'

a = 14' T
ZN = 180º
a-Lat = 38ºN
a-Lon = 015º 24.4W

Lat = 37º 46.0'N

5.7.5
Ho = 71º 18.8'
Hs = 69º 59.7'

a = 1º19.1' T
ZN = 180º
a-Lat = 23ºN
a-Lon = 065º 42.8'E

Lat = 21º 40.9'N

5.7.6
Ho = 75º 12.7'
Hs = 75º 15.4'

a = 2.7' A
ZN = 0º
a-Lat = 27ºS
a-Lon = 164º 43.8W

Lat = 27º 02.7'N

5.7.7
Ho = 42º 29.3'
Hs = 41º 10.0'

a = 1º19.3' T
ZN = 0º
a-Lat = 29ºS
a-Lon = 065º 23.5'W

Lat = 27º 40.7'N

5.7.8
Ho = 65º 32.6'
Hs = 65º 35.6'

a = 3.0' A
ZN = 180º
a-Lat = 44ºN
a-Lon = 130º 53.3W

Lat = 44º 03.3'N

5.7.9
Ho = 69º 56.4'
Hs = 69º 46.6'

a = 9.8' T
ZN = 0º
a-Lat = 17ºS
a-Lon = 146º 30.5'W

Lat = 16º 50.2'S

5.7.10
Ho = 43º 24.5'
Hs = 43º 57.3'

a = 32.8' A
ZN = 180º
a-Lat = 34ºN
a-Lon = 026º 57.8'E

Lat = 34º 32.8'N

From: Phoenix
David Burch


 - posted December 18, 2006 09:12 PM      Profile for David Burch           Edit/Delete Post 
This post has been here sometime and i see that our orignal reply is not here any longer, and i do not know the history of why that might be.

But to track down the issues...

Please post all the individual steps for just one or two of them and we can find the problem. No 1 is correct.

Did you get the answers right to problem set 3.4? if so, Ho will be the same in each one.

thanks
--david

From: Starpath, Seattle, WA


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