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#1




Sun's position relative to the planets?
I_am_on_Saturn wrote:
Is Sun positioned at the center of the elliptical orbits of all the planets? No. It lies at one of the foci of the elliptical orbits. To describe the shape completely around the Sun, you need two numbers  the nearest and farthest points, for example, or the distance across the ellipse's major axis and the ellipse's eccentricity. (Describing the *position* of that shape in space is somewhat more complex.) If not so, what is the relative position of Sun relative to all the planets? It's massive enough to be considered the center of mass of the entire Solar System  but it doesn't lie at the center of the elliptical orbits. The ellipses all have their perihelions (closest points to the Sun) at different points around the Sun, and the planes in which they lie are tilted with respect to one another.   With Best Regards, Matthew Funke ) 
#2




Sun's position relative to the planets?
"I_am_on_Saturn" wrote in message om... Hi, Is Sun positioned at the center of the elliptical orbits of all the planets? Keep in mind an ellipse has two "centers" positioned along the semimajor axis. The sun is at ONE of these centers. If so, why would we have to define nearest and farthest points of planet from Sun? If not so, what is the relative position of Sun relative to all the planets? I am trying to get the above information because I am building a Java applet to show the Solar system and for the purpose of display, I need to know the relative position of the Sun with respect to the planets. Thank you for your time, Saturn 
#3




Sun's position relative to the planets?
In article ,
(I_am_on_Saturn) wrote: Is Sun positioned at the center of the elliptical orbits of all the planets? Not quite. An ellipse has two foci. The sun is at one of these. (There is nothing of interest at the other.) Cheers,  Joe ,.  Joseph J. Strout Check out the Mac Web Directory:   http://www.macwebdir.com  `' 
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Sun's position relative to the planets?

#5




Sun's position relative to the planets?
Greg D. Moore \(Strider\) wrote:
"I_am_on_Saturn" wrote: Is Sun positioned at the center of the elliptical orbits of all the planets? Keep in mind an ellipse has two "centers" positioned along the semimajor axis. The sun is at ONE of these centers. Thanks for putting "centers" in quotes. What Strider is referring to are the *foci* of the ellipse. They are removed from the actual *center* by a distance equal to one half of the major axis' length times the eccentricity of the ellipse. For an ellipse that happens to be a perfect circle, the foci and the center are the same point. (The "eccentricity" is a measure of the "flatness" of the ellipse. For ellipses, the eccentricity is a number between zero and one. The larger the number, the more "squashed" the ellipse. An eccentricity of zero gives a circle.)   With Best Regards, Matthew Funke ) 
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