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AO-7 Orbit Numbers

I'm curious if anyone knows how Orbit numbers are computed - that is, how 
do Nova and Satscape represent them?  At 17:45 UTC on 6/24 Satscape 
reported that AO-7 was on orbit 30,900 and Nova reports that AO-7 was on 
30899.  I'm assuming that Satscape is reporting the current orbit, and Nova 
is reporting the number of orbits it has completed?

Also, is there a good website someone can point me to that will tell me how 
to compute this number if the date, time and Keplerian elements are known?

- Emily (w0eec)
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