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    Re: Altitude with artificial horizon
    From: Doug Faunt
    Date: 2021 May 21, 11:54 -0700
    John has it right.  Thompson had a good idea of his altitude above sea level,of course.
    But he was good enough I think to have taken that refraction into account, if it was known then.
    Best, doug

    Best, doug

    On Fri, May 21, 2021, 11:31 Frank Reed <NoReply_FrankReed@fer3.com> wrote:

    John Clements, you wrote:
    "I believe you're asking about the effect that your altitude above the surface of the earth has when using an artificial horizon. The first-order approximation is this: it doesn't matter at all."

    Oh! That's an interesting interpretation of this question. You may well be right that this is what Doug was asking about. Doug Faunt, how about it? Can you elaborate on what you were asking about?

    Frank Reed

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