From:	NOSPAMsl AT psycode DOT com (Gili)
Newsgroups:	gac.physics.astronomy,nctu.club.astronomy,relcom.fido.su.astronomy,tw.bbs.sci.astronomy,comp.os.msdos.djgpp
Subject:	Orbits, planets, PLEASE HELP!
Date:	16 Mar 1998 16:51:07 GMT
Organization:	Generation.NET
Lines:	26
Message-ID:	<bWLoegW7sFse-pn2-nOBQTFs4XI88@portA01.Generation.NET>
Reply-To:	NOSPAMsl AT psycode DOT com
NNTP-Posting-Host:	portD25.Generation.NET
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Hello,

	I have a science project due next week. I am programming something 
which will find the most efficient orbit given certain parameters. 
However, I have been unable to find the locations of all planets (and 
their moons) in our solar system at a fixed time. In order for my 
program to work, I must have the positions of all planets (and their 
moons) at a fixed time (so I know where they all begin off) and I also
need to know their exact velocity at that given time.

	My program will launch a rocket into space where it will be totally 
under the influence of gravity (which is why I need to know the 
positions/velocities of those planets.) However, I have run into 
another problem, how do I know the positions of the planets in the 
solar system after 1 second has past? The same goes for my rocket..

	I can resolve the force vectors being applied by all the 
planets/moons on my rocket, and I know its position and velocity. But 
where do I go from there? How do I know where it will be a second 
later?

	Please help me as soon as possible. Thank you,

PS: Please email your response to "sl AT psycode DOT com"

Gili

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