The figure shows the elliptical orbit of...

The figure shows the elliptical orbit of a planet about the sun S. An ellipse is the curve obtained when a cone is cut by an inclined plane. It has two focal points. The sum of the distances to the two focal points from every point on the curve is constant. `F_1 " and " F_2` are the two focal points of the ellipse . The shaded area `CF_1D` is twice the shaded area `AF_1B. t_1` is the time taken by the planet to move from C to D and `t_2` is the time to move from A to B

Which laws do we understand from the above diagram and description?

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