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    Interesting web site
    From: Lu Abel
    Date: 2006 Oct 23, 21:57 -0700

    It's aviation-oriented, but interesting.  Will show a great-circle path
    between any two airports.  But it will also show a great-circle RANGE
    from any airport.  (The circles are distorted by the map projection)
    Not quite exactly what one might use for sight reduction, but if the GP
    of a body were close to an airport, one could get a circle of position
    for one's sight.
    I became aware of through a posting of the following picture
    http://gojko.net/images/direction.jpg with a challenge to figure out
    where the signpost was located.
    The answer is that it's on the Cape of Good Hope.
    One person guessed that answer based on the proximity to Antarctica.
    Another simply Googled "south pole 6248 km" and found the picture in
    somebody's travelogue with mention of its location.
    A third person used the great circle site.  He simply entered
    12541km@JFK, 14724km@NRT, 9294km@CDG (the airports in New York, Tokyo,
    and Paris) into the web site and got three circles of position crossing
    at the Cape of Good Hope!!
    Lu Abel
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