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    Re: Site reduction assisted by spreadsheet?
    From: Greg Rudzinski
    Date: 2013 May 7, 12:34 -0700

    Samuel,

    Try this calculator for sight reduction. Save it to your laptop desk top for future calculations. Remember that the Z rules apply.

    North Latitude if LHA is > 180* then Zn = Z if LHA < 180* then Zn = 360*- Z

    South Latitude if LHA is > 180* then Zn = 180 - Z if LHA < 180* then Zn = 180* + Z

    Zn = true azimuth

    Save the Nautical Almanac 2013 and increments to your laptop desk top if you do not have one on hand.

    Greg Rudzinski

    Site reduction assisted by spreadsheet?
    From: Samuel
    Date: 2013 May 7, 03:55 -0700
    I'm new to celestial navigation having recently purchased a Davis Mark 25 sextant and wanting very much to be able to do both a sun sight reduction and a intercept plot.

    Presently, I'm experimenting with spreadsheets obtained from http://www.navigation-spreadsheets.com/ but find that it is necessary to use several spreadsheets to obtain the figures for the intercept plot. (Also, the format for entering angle readings is tedious).

    It would be more efficient to use only one spreadsheet for a sight reduction.

    Can you direct me toward one such spreadsheet?


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