Dne 22/01/2018 v 02:22 Peter Riedt napsal(a):


The signficance of me Fc comparing to Fg is that Huygens in 1659
was able to already calculate the gravitationl force without knowing G or M.

As approximation for circular orbits.

Otherwise he would need for given position
to calculate curvature radius
to calculate speed
to calculate the angle of the force wrt trajectory

This was only possible after 1798 when Cavendish discovered G in the
laboratory and the final Fg formuala came into being. I do not know by
whom this formula was first used but would like to know.

Standard gravitational parameter G.M was known even before that.
Even today it is known with much better relative accuracy
than G or M.

--
Poutnik ( The Pilgrim, Der Wanderer )

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