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    Re: Definition of Arctic Circle
    From: Nigel Gardner
    Date: 2000 Oct 09, 6:06 AM

    The Arctic Circle for navigators is the compliment of the obliquity of the
    ecliptic but will change of course with nutation, with a period of about 19
    AC is also called the North Polar Circle but whether this is a geographers'
    term and if they have settled on a fixed value for its latitude or not I
    don't know. At one time the the name 'Arctic Circle' was used to describe
    the circumpolar path of the Great Bear.
    Back to the previous query as to whether the midnight sun was observable
    south of the Artic Circle, if the standard allowance for refraction and SD
    is applied then we can move 50' although funny things do happen to
    refraction at low temperatures, apply a bit for height of eye and we can
    move even further South.
    On the couple of occasions I have taken a midnight merpass shot the sun was
    looking like a badly poached egg and the limbs were difficult to make out.

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