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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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    Re: Lunar distance measurement in ideal conditions: attainable accuracy.
    From: Greg Rudzinski
    Date: 2013 Jan 17, 06:10 -0800

    Paul,

    The attached image shows a near limb. If the star or planet were on the opposite side then it would be a far limb observation.

    During a full Moon there will be a problem in determining which limb to use. The limb that is closer to the Sun is the correct limb to use. Waiting for the Moon to become noticeably gibbous will prevent using the wrong limb. If the Moon is near full it will also be necessary to use the sextant shades. I like doing lunars using the Moon shaded with the second weakest index mirror shade and the star or planet shaded with the weakest shade. Try with and without shades and you will quickly see that shading improves consistency.

    Greg Rudzinski

    [NavList] Re: Lunar distance measurement in ideal conditions: attainable accuracy.
    From: Paul Dolkas
    Date: 16 Jan 2013 21:45
    Frank-

    Neat calculator! Is it available for downloading on an I phone?

    Also, what does “Near” or “Far” signify in the window next to distance?

    -Paul

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