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    Re: A ramble on "new improved methods"
    From: Brian Walton
    Date: 2020 Jun 30, 22:26 -0700

    Greg,

    Thank you. I would expect the Bernecky/Minelli time sight product with 30 special pages to have an advantage over the Doniol/Haversine layout with only 7 pages.

    A complication is that if you already have log haversine /versine and log sin tables on board for other reasons, the Doniol method can be used anyway, and those log tables also used for a multitude of other CN problems.

    A time sight formula avoiding calculators is:

    Ver LHA = [ Ver ZD - Ver (Lat +or- Dec)] divided by (Cos Lat x Cos Dec)

    If you wish to avoid logs and calculators altogether, a fabricated Bygrave tubular slide rule works in blustery conditions, but cannot manage a time sight.

    Regards,

    Brian Walton

       
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