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    Re: sextant index error measurement
    From: Richard M Pisko
    Date: 2006 Nov 8, 14:56 -0700

    On Sat, 04 Nov 2006 01:03:48 -0500, Bill wrote:
    > I had lunch with an old college buddy a while back that was US
    > Navy and now owns a surveying company.  On topic he did
    > mention, if I recall correctly, that in some parts of the USA
    > traditional methods (optical?) had to take a break during the
    > hottest part of the day due to refraction.
    I checked with a friend who worked in Arizona.  He said he had a
    "clear mental image of a range pole at a half mile looking like
    a snake through the transit", and that the more important angles
    were shot in the morning.  But . . . they kept working.
    Probably depends on the accuracy you need.
    Richard, 2006-Nov-07 10:56:01 AM GMT - 6 hours for summer
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