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    Re: Index Error
    From: Fred Hebard
    Date: 2004 May 7, 16:19 -0400

    On May 7, 2004, at 10:54 AM, Robert Eno wrote:
    > So let me get this straight:
    > 1. Any index error in the sextant will be reflected by one reading
    > differing from the other; that is the upper limb observation may be
    > greater than it should be, while conversely, the lower limb observation
    > would be less than it should be. They should balance each other out.
    > 2. The sum total of the off and on readings divided by four should
    > yield
    > the correct semi-diameter. There is no need to factor in the index
    > correction because one value should balance out the other. In
    > otherwords,
    > the index correction is already inherently factored in by virtue of the
    > upper and lower limb values differing by X minutes of arc.
    > Am I on track here gentlemen?
    > Robert

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