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    Re: Index corr., Octant as dipmeter
    From: Jared Sherman
    Date: 2004 Nov 21, 20:00 -0500

    Thank you, George. My understanding was that part of those "changes" was
    also the fact that the land and water heat and cool very differently with
    solar radiation, so that the air masses above them also heated and cooled
    VERY differently, i.e. which is why hang gliders find thermals often based
    what is under them, i.e. water, land, bright areas, dark ones.
    If variations in the temperature of the air mass over the water are
    important, how can it not matter that the air masses "here" and "there" are
    going to be at very different temperatures, i.e. from one being over the
    land and the other over the water, where air temperatures will be radically
    To what altitude are these changes in air temperature problematic?

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