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    Re: Summer Solstice
    From: David C
    Date: 2016 Dec 21, 12:35 -0800

    You have used the sun altitude correction table.

    With AH-sights you have to use the star and planet altitude correction table instead.

    Which means that the observed altitudes are smaller and the intercepts bigger than in your calculations.

    The difference between an AH sight and a horizon sight is that the former does not require a dip correction. As I am using an AH I am not correcting for dip.

    Consider an altitude of 37 degrees.

    From the Air Almanac 2016 R = 1' and SD = 16.3'. I was using the lower limb so the correction is +15.3'. Note that refraction is given to a precision of 1'.

    From the NA 1973 Sun's Correction Oct-March (scan attached) the correction is +15.0. This is to a precision of 0.1'.

    I believe that I was using the correct value but maybe I am missing something?



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