Expression for Orbit as function of time ?

Two masses orbit their barycentre elliptically, defining a plane; there
are no other forces.

Is there an expression for the angle defining within the plane the
direction of the line between their centres as a function of time? An
expression which uses only operators and functions supported by, say,
JavaScript or Pascal?

--
(c) John Stockton, nr London, UK. Turnpike v6.05 MIME.
Web URL:http://www.merlyn.demon.co.uk/ - FAQqish topics, acronyms & links;
Astro stuff via astron-1.htm, gravity0.htm ; quotings.htm, pascal.htm, etc.
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On Sun, 14 Mar 2010 21:19:22 +0000, Dr J R Stockton
wrote:


Two masses orbit their barycentre elliptically, defining a plane; there
are no other forces.

Is there an expression for the angle defining within the plane the
direction of the line between their centres as a function of time? An
expression which uses only operators and functions supported by, say,
JavaScript or Pascal?

Kepler's equation. The approximation is the equation of the center.

Bud

"William Hamblen" wrote in message
...
On Sun, 14 Mar 2010 21:19:22 +0000, Dr J R Stockton
wrote:


Two masses orbit their barycentre elliptically, defining a plane; there
are no other forces.

Is there an expression for the angle defining within the plane the
direction of the line between their centres as a function of time? An
expression which uses only operators and functions supported by, say,
JavaScript or Pascal?

Kepler's equation. The approximation is the equation of the center.

Bud

http://www.androcles01.pwp.blueyonde...rbit/Orbit.xls