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  • 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.
    '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.
    Attached Files
    Last edited by Tony Pike; 29-10-2012, 15:24.
    Best Regards,

    Tony Pike

    Give Sergei back his dignity......Simples!

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    • #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
      'Kas.

      ------------------------------------------------------
      " Dumb Questions are better than Dumb Mistakes"

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