When the ellipse is more circular, the foci are closer together is notice about the spacing of the foci when the ellipse is very round and circular as opposed to when the ellipse is very flat.
A planet sweeps out half of its orbit as it goes from aphelion to perihelion, and the same region is swept out as well as it moves from perihelion to aphelion, therefore the time required to transit from one point to the other is the same.
Thus, When the ellipse is more circular, the foci are closer
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