If you mean:Originally Posted bysweet

Using Kepler's second law - that the area swept out in unit time by a planet

is a constant - then yes.

At Aphelion and Perihelion the velocity of the planet is at right angles to the

vector from the Sun to the Planet, so the area swept out in unit time in

each case is:

and:

at Aphelion and Perihelion respectivly. Kepler's second law tells us these are

equal so:

,

so:

Hence:

RonL