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Greetings, 

I recently got the book by L. Gray "100 Problems in Celestial Navigation".   
The very first problem, which had quite a lot of explanations  "how to" for 
some reasons (?) didn't mention and didn't counted for interpolation for 
longitude in calculating nautical and civil twilight time.  The interpolation 
for the latitude was done but not for the longitude.  If I'm not mistaken 
(correct me please if I'm wrong) but the time of the phenomenon (twilight, 
f.e) is tabulated to the zone meridian. In the problem 1-1 DR longitude is 50 
deg.W.  The way I understand it the interpolation should be done for the 
closest zone meridian which in this case will be 45 deg.W.  I looked in the 
Appendix but still didn't figure out why interpolaion for Longitude wasn't 
included.  I made the interpolation and of course the results were different 
from what were in the book.

Quite possible the explanation for this can be very trivial:

1.  I overlooked something in the text

2.  I didn't understand something which quite obvious for everyone else

3.  ??? "Oh, sorry, we forgot to include it"  (which I doubt because the book 
is very well-known and definitely well-proved). 

So, this is my question: am I mistaken regarding this ?

Thanks  


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