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## Main Question or Discussion Point

Is my proof of Kepler's 2nd law correct?

area of sector of circle/ellipse (that the planet sweeps out): (1/2)(r^2)O

O is theta!

dA/dO = (1/2) (r^2)

dA= (1/2) (r^2) dO

dA/dt = (1/2) (r^2) dO/dt

It can't be that simple???? Can it??

area of sector of circle/ellipse (that the planet sweeps out): (1/2)(r^2)O

O is theta!

dA/dO = (1/2) (r^2)

dA= (1/2) (r^2) dO

dA/dt = (1/2) (r^2) dO/dt

It can't be that simple???? Can it??