Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!husc6!rice!hypatia!phil
From: phil@hypatia.rice.edu (William LeFebvre)
Newsgroups: sci.space.shuttle
Subject: Re: Why are there launch windows?
Message-ID: <2951@kalliope.rice.edu>
Date: 27 Mar 89 21:43:56 GMT
References: <36700005@hcx2> <256@cbnewsl.ATT.COM> <7230@thorin.cs.unc.edu> <1665@ubu.warwick.UUCP> <1989Mar24.230920.17804@utzoo.uucp>
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Reply-To: phil@hypatia.rice.edu (William LeFebvre)
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In article <1989Mar24.230920.17804@utzoo.uucp> henry@utzoo.uucp (Henry Spencer) writes:
>>>>In article <36700005@hcx2> tom@hcx2.SSD.HARRIS.COM writes:
>>>>>Why do earth orbit missions have launch windows?
>...
>The main constraint on comsat launches is power requirements during the
>climb to Clarke orbit....

Sunrise and sunset at the abort sites also play a part in calculating the
window:  sunset at the trans-atlantic abort sites and sunrise at the
abort-once-around site(s).

			William LeFebvre
			Sun-Spots moderator
			Department of Computer Science
			Rice University
			<phil@Rice.edu>