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**"Radius" of an Ellipse**

a couple things I'm trying to fit together.

First: a planet orbits a sun (positioned at one focus) at an certain speed. At any given time of year it will be at that same spot year after year... i have little clue how to make that work or solve for it.

Second: i need to take that point and deterimine what it's distance is from the sun.

Note: i am a high school graduate, but did only average in mathematics and conics was most certainly not a strong point, however i have a bascic understanding.

Purpose: i need to determine the distance a planet is from it's sun for a 1 year cycle to determine the amount of energy it will receives on any given day.

thx