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http://gc.kls2.com/

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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