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    Ex-meridian Formula Variant
    From: Greg Rudzinski
    Date: 2012 Apr 17, 08:43 -0700

    Try this variant of the ex-meridian formula for use with Bowditch vol. 2 table #29 (table #24 in latest edition)

    .267 (a)(Degrees of Meridian Angle)^2

    The above formula produces the same correction in minutes of arc as the standard formula.

    (a)(Minutes of Time from Meridian Transit)^2 / 60

    I find working directly with the meridian angle in the variant formula a bit quicker and more convenient than the standard formula.

    Greg Rudzinski


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