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» Online Classroom   »   » Public Discussion of Cel Nav   » excercise 5.7 How to Get a-lat

   
Author Topic: excercise 5.7 How to Get a-lat
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 - posted June 26, 2010 08:31 AM      Profile for Bg           Edit/Delete Post 
I am having some problems in getting a-lat. I have read through the book a few times and from what I can see they show me to take the a-lat from box 4 but that does not equal the same in box six.. Anyone who can steer me in the right direction?
HHEW


 - posted June 26, 2010 09:12 AM      Profile for HHEW           Edit/Delete Post 
The a-lat (assumed latitude) is the latitude nearest your DR. With this question's DR of 28° 44' S, you'd use 29° 00' S.

You write this same 29° 00' S into box 6 so that you will have in one place all the info you need to go to the plotting sheet - intercept (a), true bearing (Zn) to the sun, and the latitude (a-lat) and longitude (a-lon) of the point from which you lay off the bearing, mark the intercept and draw the LOP.

-Hewitt Schlereth

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 - posted June 27, 2010 09:16 AM      Profile for Bg           Edit/Delete Post 
Thank you for your help.. Going to give it another attempt and see where I land up.


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