Proof: Kepler's 2nd Law ( Equal Areas in Equal Times: Variable  Speed Model )
"I also ask you, my friends, not to condemn me entirely to the mill of mathematical calculations, and to allow me time for philosophical speculations, my only pleasures"  Johannes Kepler ( 1571  1630 )
Vector Analysis
Now, Newton's Universal Law of Gravity together with Newton's 2nd Law of Motion gives
Then, again,
Finally, Kepler's 2nd Law of Equal Areas in Equal Times:
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