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#1




How to Interpolate to  forgotten
Hi BGS,
Can anyone explain how to interpolate on air almanac to solve problems for sunset & sunrise LMT. Thanks Kas.
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'Kas.  " Dumb Questions are better than Dumb Mistakes" 
#2




Re: How to Interpolate to  forgotten
Okey dokey,
See image below. The blue box is dated 02nd January but falls across two latitudes, N 56 and N 58. If you are looking for the Sunrise time on 2nd January at N 57, you simply take the average of these two times. N 58 = 08.45 N 56 = 08.31 (16.76 / 2 = 08.38) The red box is looking for a time at N 70 on a date between 20  23 January. 20/01 = 11.06 23/01 = 10.42 Look at the difference between 10.42 and 11.06 = 24 minutes. 24 minutes / 3 = 8 minutes (You need to divide by 3 as there are 3 days difference between 20th and 23rd) Therefore: 20/01 = 11.06 21/01 = 10.58 22/01 = 10.50 23/01 = 10.42 The green box requires two way interpolation to find a time at a date between 26th and 29th and at a latitude between N 62 and N 64, let's say N 63 on 27th. DATE 26th  27th  28th  29th N 64 08.58 ***********08.49 N 63 08.49 08.46 08.44 08.41 N 62 08.41 ***********08.34 It is extremely difficult trying to be absoutely accurate with these and to be honest +/ 1 or 2 minutes is neither here nor there. You will not be expected to intepolate to 1 minute of accuracy in the exams. Hope that helps.
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Best Regards, Tony Pike bristol.gs bristol ground school Give Sergei back his dignity......Simples! Last edited by Tony Pike; 29102012 at 15:24. 
#3




Re: How to Interpolate to  forgotten
Hi Tony,
This is simply one of the best explanations I ve received. Thanks a million. Cheers, Kas
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'Kas.  " Dumb Questions are better than Dumb Mistakes" 
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