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    Re: Parallel Sailing question
    From: Peter Hakel
    Date: 2019 Jul 31, 21:48 -0700

    Jayson,

    Following Frank’s reply I used sailings.xls and composite.xls spreadsheets from:
    http://www.navigation-spreadsheets.com

    Treating 80° S, 179° W as departure and 80° S, 179° E as destination I get a distance of just under 21 NM for both great circle and parallel sailing. Track = 270 (west) in both cases. Note: in composite.xls I entered the limiting parallel in cell B9 as -80.00000001 to make the math behind this spreadsheet go through.

    This distance of 21 NM is computed as 120 (minutes of arc for the 2° change in longitude) multiplied by the cosine of -80° (latitude).


    Peter Hakel
    35° 53’ N
    106° 19’ W

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