Dne 20/02/2016 v 17:55 Thomas 'PointedEars' Lahn napsal(a):

I do not see the reason why did you hijacked my post to SPR,
as nature of topic is not SR/GR related.

(“twin binary stars” contains redundancy as both “twin” and “binary” refer
to the number 2. Also, one system of a pair of stars orbiting each other is
called a “binary _star_”.)

Oh, your usual obsessive nitpicking arrogance...

Find the help of a psychologist,
as life around of you must be challenging.

Twin is adjective describing stars of a binary star system,
while binary is adjective describing their relation.

Most of stars of binary systems are not twins,
while twin stars are most probably not
a part of the same binary system.

The plural can stay, as the topic is focused
on individual stars rather than on the system.


Kepler’s laws (1609–1619 CE) are laws of *planetary* motion. They were
.........
Church, for which he was burned at the stake in 1600.]

I am quite familiar with this history.

Therefore, as Isaac Newton (1687) showed already, Kepler’s laws are only an
approximation of the observed planetary motion.

But it is not fully the case of the 3rd law with sum of masses.
It is applicable as well for planet-moon systems
and binary star systems.

See e.g. http://www.astro.caltech.edu/~george...Ay20-Lec4x.pdf
Kepler’s Laws, Binaries, and Stellar Masses.

GR effects for stars of Sun mass at distance 2 AU are very minor,
and negligible wrt to accuracy of data.

--
Poutnik ( the Czech word for a wanderer )

Knowledge makes great men humble, but small men arrogant.