Saying "Cheese" on a Satellite Map

Question

How would I go about finding out when the satellite\airplane taking the aerial photographs that get used on online maps (yahoo, google) is passing over so I can climb to the roof of a skyscraper, look up and wave :)

Answer 1

Find the company that set the satellites orbit and ask them.

Don't bother about waving, unless its sub-mitre resolution it won't pick you up in enough detail.