Dne 20/01/2018 v 08:45 Peter Riedt napsal(a):

The two formulas work for all eccentricities.

Yes, they do.

But the centripetal force formula
calculates for the elliptical orbits
the centripetal force, not the gravitation force.

And it needs to know the curvature in advance to do so.

--
Poutnik ( The Pilgrim, Der Wanderer )

A wise man guards words he says,
as they say about him more,
than he says about the subject.