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    Re: Sundog
    From: Bill B
    Date: 2013 Feb 11, 20:18 -0500

    On 2/11/2013 2:48 PM, Frank Reed wrote:
    > ------------------------------------------------------------------------
    > There was a very bright sundog yesterday at sunset here. Photo linked.
    > Here's a little navigation puzzle: you're walking in a hilly area near
    > sunset on February 10 in latitude 41 N. You see a sundog about 5 degrees
    > high directly ahead of you but you can't see the Sun (behind a hill to
    > your left). In what direction are you walking?
    Using 41d N and 75d W with the center of the sundog at 5d I've plugged
    in the following:
    declination:       14d 03!7
    dip:                   -2!7
    refraction:            -9!8
    temp/press correction: -0!6 (nor'easter)
    Hc:                 4d 46!9
    Azimuth:          246d 41!1
    Sundog offset:     22d
    Direction approx: 268D 41!1
    Bill B

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