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Old February 21st 16, 10:52 AM posted to sci.astro
Poutnik[_5_]
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Default 3rd Kepler law, twin stars, centres, and semi major axis

Dne 21/02/2016 v 09:52 Peter Riedt napsal(a):

Newton copied his law from Kepler, not the other way.

You got it wrong. In science, everything new
is built on the top of what was known before.
It is not like copying in art.

Kepler laws are not laws, but empirical rules,
based on Tycho de Brahe data.

They are rules of planetry kinematic,
they say nothing about gravitational interaction,
being proportional to masses
and reciprocal to squared distance.

Newton law is low of gravitational interaction,
similarly as the Coulomb law for electrostatic interaction.

All Kepler laws(rules) are direct consequence of the Newton law,
that furthermore is not limited to ellipses.


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Poutnik ( the Czech word for a wanderer )

Knowledge makes great men humble, but small men arrogant.