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    Re: Altitudes, close to 90
    From: Alexandre Eremenko
    Date: 2004 Nov 29, 13:22 -0500

    Dear Trevor,
    I repeat the sentence which you seem to object:
    >The source of error is that you cannot determine precisely
    >the point on the horizon which is exactly "below" the body.
    Actually this is a citation from Maskelyne.
    I have no experience of my own in measuring altitudes above the
    natural horizon: unfortunately the horizon is not vizible
    from my observation point:-(
    So I can only speculate on this.
    I read in many places that measuring altitudes close to 90
    is extremally hard, and I was trying to find a theoretical
    reason for this. After having posted the message
    "Altitudes close to 90"
    I noticed that my explanation was incorrect, and immediately
    recognized this in my next posting.

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