I went and watched one today after getting the data from
http://www.heavens-above.com/ . Are these common everywhere ? How about a
navigation system that uses a few Iridium flares to locate its position ?
(just for fun) using a ccd camera or similar hooked to a computer ;-)

(Hint: take your location with a grain of salt if you live in a place
larger than about 300 meters across, or use gps. In my case the groundpath
was given as a few km to the east but it went directly overhead - I nearly
missed it - the flare lasts about a second at most - however it is very
bright, brighter than Venus).

Peter

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