Re: Tidal effect on solar systems?

On Nov 15, 1:14 pm, pau...@xxxxxxx (Paul Schlyter) wrote:
In article <90982526-199a-4120-951a-b4da50792...@xxxxxxxxxxxxxxxxxxxxxxxxxxx>,



dkel...@xxxxxxxxxxx <dkel...@xxxxxxxxxxx> wrote:
On Nov 14, 10:45 am, "Greg Neill" <gneil...@xxxxxxxxxxxxxxxx> wrote:
Dave Typinski wrote:
----snip---

Dunno about that.  It would be interesting to perform a simulation
to see what happens.  Maybe if I find myself with some time on my
hands I'll give it a go.  It should be easy enough to "embed" a
standard orbit integration in a background field to see how things
develeop.  Come to think of it, consider the Earth-Moon orbit as it
is effected by the Sun's gravity...

Hi
And the ratios of the Earth/Moon/Sun are a few orders of magnitude
closer than the galactic center or even another star in the galaxy.
Dwight

Indeed....

The Sun has a mass of one solar mass and a distance of one AU

Our galaxy has a mass of some 600 billion (6E+11) solar masses and our
distance to the galactic center is some 26,000 light years or some
1.6 billion (1.6E+9) astronomical units.

The tidal force is proportional to the mass and inversely proportional
to the third power of the distance.  If we use solar masses as the mass
unit and AU's as the distance unit, we get:

Tidal force from the Sun:  1/1^3 = 1

Tidal force from our Galaxy:  6E+11/(1.6E+9 ^ 3) = 1.5E-16

Therefore the tidal force from the Galaxy is some 8 quadrillion times smaller
than the tidal force from the Sun.  Therefore the tidal forces (i.e.
the gravitational prturbations) from the Galaxy can be safely ignored
when integrating the motion of the planets in our solar system.

THis simple computation assumed that the entire mass of our Galaxy
resides at the center of the Galaxy.  As we know, this isn't the case
but the mass is distributed all over the Galaxy - some of it in parts
farther away from the Galaxy's center than our Sun.  This makes the
tidal force from the Galaxy upon our solar system even smaller....

--
----------------------------------------------------------------
Paul Schlyter,  Grev Turegatan 40,  SE-114 38 Stockholm,  SWEDEN
e-mail:  pausch at stjarnhimlen dot se
WWW:    http://stjarnhimlen.se/

That empirical junk has a definite beginning -

"It is indeed a matter of great difficulty to discover, and
effectually to distinguish, the true motion of particular bodies from
the apparent; because the parts of that absolute space, in which those
motions are performed, do by no means come under the observation of
our senses. Yet the thing is not altogether desperate; for we have
some arguments to guide us, partly from the apparent motions, which
are the differences of the true motions; partly from the forces, which
are the causes and effects of the true motion" Newton

It is qualified by the most ridiculous treatment of apparent
retrogrades and their resolution -

"For to the earth they appear sometimes direct, sometimes stationary,
nay, and sometimes retrograde. But from the sun they are always seen
direct, " Newton

Much like the orbital motion of Uranus and the observed specific
turning with respect to the Sun,the observation that we do see orbital
motion directly is the central theme,working method and insight of
heliocentric astronomy yet nobody affirms it ! -

http://antwrp.gsfc.nasa.gov/apod/image/0112/JuSa2000_tezel.gif

The utter contempt shown to astronomy,its methods and insights in
order to support an agenda that never worked is hardly compensates for
the incredible opportunities which exist by scrapping this voodoo
speculative empirical chanting. Surely somebody finds astronomical
influences on climate and geology important enough to actually start
paying attention or must humanity suffer this absolute empirical junk
dumped into the celestial arena under the name of astronomy.I have
never encountered cowardice like that shown here and no life is worth
following themes that are hardly above flat -Earth concepts and with
very strong ties to 'astrology'.


.

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