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  #1  
Old February 18th 04, 12:24 PM
George Kinley
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Default Moving Around

I have trivial question
Our earth is moving around sun, and simultaneously also rotating with
galaxy, Considering only the galaxy rotating factor , also sun and all
other stars are also rotating with galaxy.
So are they all moving in same direction at same speed, is it possible that
sun is moving away from us
  #2  
Old February 19th 04, 03:44 PM
Gordon D. Pusch
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Default Moving Around

George Kinley writes:

I have trivial question
Our earth is moving around sun, and simultaneously also rotating with
galaxy,


All motion is _Relative_. There is no such thing as "absolute motion."


Considering only the galaxy rotating factor , also sun and all other
stars are also rotating with galaxy. So are they all moving in same
direction at same speed,


Since your assumption is false, your question is irrelevant.


is it possible that sun is moving away from us


The distance from the Earth to The Sun increases during the `outgoing' half
of the Earth's elliptical orbit around the Sun, from perihelion to aphelion;
during the other half of the Earth's orbit, the distance decreases again by
the same amount (neglecting perturbations of the other planets). However,
the Earth's orbit has absolutely NOTHING to do with the rotation of the galaxy;
these two physical processes are totally independent of each other.


-- Gordon D. Pusch

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  #3  
Old February 25th 04, 05:58 PM
Henry Spencer
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Default Moving Around

In article ,
George Kinley wrote:
...Considering only the galaxy rotating factor , also sun and all
other stars are also rotating with galaxy.
So are they all moving in same direction at same speed, is it possible that
sun is moving away from us


No. The Earth's motion around the Sun is known very accurately, and our
distance from the Sun is quite stable. (It varies slightly with the
season, because Earth's orbit is not quite circular, but both the pattern
of variation and the average distance are stable.)

The Sun overwhelmingly dominates Earth's motion. Speaking loosely, Earth
orbits the center of the galaxy only because the Sun does so.
--
MOST launched 30 June; science observations running | Henry Spencer
since Oct; first surprises seen; papers pending. |
 




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