"The orbits of planets are elliptical with the sun at one of their two foci"
The elliptical path of a planet around the sun is shown in the figure. Here f1 and f2 are the foci of an ellipse and sun is at either of them.
Second law:
"The area swept by a line, joining the sun to a planet, per unit time is constant."
Third law:
"The Square of the periodic time (T) of any planet is directly proportional to the cube of the semi-major axis (a) of its elliptical orbit."
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