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From: space@mit-mc
Newsgroups: net.space
Subject: Launch Windows
Message-ID: <984@mordor.UUCP>
Date: Thu, 7-Mar-85 13:12:36 EST
Article-I.D.: mordor.984
Posted: Thu Mar  7 13:12:36 1985
Date-Received: Sun, 10-Mar-85 07:46:37 EST
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From: Carl Rosene 

Launch windows for satellite missions come from at least a couple of things:

 1) Accompanying experiments or observations (especially astronomical
    observations or tracking) might have requirements for the orbit. (What
    portion of the sky is visible during the night etc.)

and

 2) Satellite deployments typically will have lighting requirements (So that
   you can you are doing). These lighting requirements are met by seeing
   that the shuttle's "day" (or "night") sky is over the right portion of
   the earth. 

The above considerations lead you to launch windows.