Posted on 01/09/2016 6:12:50 PM PST by MtnClimber
Consider the movement of the earth's surface with respect to the planet's center. The earth rotates once every 23 hours, 56 minutes and 4.09053 seconds, called the sidereal period, and its circumference is roughly 40,075 kilometers. Thus, the surface of the earth at the equator moves at a speed of 460 meters per second-or roughly 1,000 miles per hour. As schoolchildren, we learn that the earth is moving about our sun in a very nearly circular orbit. It covers this route at a speed of nearly 30 kilometers per second, or 67,000 miles per hour. In addition, our solar system--Earth and all-whirls around the center of our galaxy at some 220 kilometers per second, or 490,000 miles per hour. As we consider increasingly large size scales, the speeds involved become absolutely huge!
(Excerpt) Read more at scientificamerican.com ...
I guess the answer always is in relation to what.
I wonder if there is a place where all the universe, all the galaxies etc. are moving from or towards?
I’m a little bit dizzy after reading that article.
Hope we don't get a speeding ticket.
I think all galaxies in our region are moving toward the massive feature called The Great Attractor.
How does a plane flying east keep up?
Thanks.
All movement is relative, as there is no universal zero spot.
If a person were able to go back in time just a couple of seconds, the earth would be countless miles away from the point at which the person went back in time.
In order to go back in time and remain on earth you would also have to move a great distance through space as well.
This might mean that worm holes are the only "practical" method of space-time travel.
“Scientific American.” Scientific? American? Take a good long look at both and draw your conclusions.
The answer is here in:
There is a non sequitur here. "Leo" represents a direction in the sky, in which we are moving "relative to the CBR". "Leo" does not represent an object wrt which we have a relative velocity.
Not knowing any better, I would have to suppose that our velocity wrt the brighter stars of the constellation Leo, are significantly less than the cited 390 kps.
I await instruction to the contrary.
Is the north end of the earth the front of the spaceship? Or are we traveling “sideways”?
I have wondered about that too. Also why do planes flying West not go at super speed or is it go backwards?
I guess the atmosphere must rotate along with the surface. Obviously the air right close to the surface does not constantly blow at several hundred miles per hour.
THAT’S the one I was just looking for!
bingo
I suppose if you are one the part of the circle where you are moving opposite to the way the galaxy is moving and you are moving opposite to the way the sun is moving and opposite to the way the earth is spinning, you are going so slow you are actually going backwards.
Relative to what? The article keeps shifting its reference point.
I think you are right. The author says that our total velocity is in that direction wrt CBR. What he did not say was that Leo is rotating around the center of the Milky Way with us so our composite velocity is slowly changing angle as we spin around the center of the galaxy. It is just for our lifetimes velocity is in the direction of Leo.
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