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    Re: Lunar Distance Hs and Prism Level.
    From: Frank Reed
    Date: 2007 Sep 19, 01:01 -0400

    Mike, you wrote:
    "I was wondering if anyone has any experience utilizing Hs as
    per Bruce Stark's book procedure as opposed to the regular practice of
    Hc for Lunar Distance?"
    Sure. I've done some with Hs but usually I skip that step since computing
    power is cheap today... reall, really cheap! Historically, shooting the
    altitudes saved time. It was easier and quicker than calculating them in
    almost every case because the extra work of computing altitudes was NOT
    cheap. Using the clearing tool on my web site, you can enter the observed
    altitudes if you have them available. Otherwise, leave those blank and they
    will be calculated.
    To translate, for those new to the topic, using Hs means a raw measured
    altitude and Hc means a computed altitude (H for hauteur -French for
    altitude, s for sextant, c for computed).
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