From: jbgrosh AT lancnews DOT infi DOT net (John) Newsgroups: gac.physics.astronomy,nctu.club.astronomy,relcom.fido.su.astronomy,tw.bbs.sci.astronomy,comp.os.msdos.djgpp Subject: Re: Orbits, planets, PLEASE HELP! Date: Tue, 17 Mar 1998 00:35:22 GMT Organization: zero - Chaos: ten Message-ID: <3512c37c.28005093@news.norfolk.infi.net> References: NNTP-Posting-Host: pm4-190.lns.infi.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 41 To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp Precedence: bulk Here is the NASA Twelve Year Planetary Ephemeris: 1995 - 2006 for our solar system. http://planets.gsfc.nasa.gov/TYPE/TYPE.html If you get this done this year, let alone this week you should immediately apply for a job at NASA. Regards, John On 16 Mar 1998 16:51:07 GMT, NOSPAMsl AT psycode DOT com (Gili) wrote: >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