2007-11-09 02:06:36 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
Yes it does. This is precession and the current North Star will not be that in about 10,000 years.
2007-11-09 02:12:45 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Depends in relation to what.
The Earth is so massive that, in relation to Earth's entire mass, the axis does not change. However, the crust does float on the mantle and moves around (albeit very, very slowly). Therefore, the latitude and longitude of a "fixed" point on Earth's surface (for example, an observatory) does change over centuries, giving the impression that the axis does move.
The Earth is not exactly spherical. It has an equatorial bulge (the equatorial diameter is larger than the polar diameter). Because the axis is tilted, the pull of the sun on the bulge (compared to the pull on the rest of the 'sperical' portion of Earth) tries to correct the tilt. Becasue the Earth spins, this causes 'precession' (a gyroscopic effect) which changes the orientation of the axis in relation to the rest of the universe. The precession period is 25,800 years.
The Moon has a similar effect, but to a lesser extent. The period, called 'nutation' is a lot shorter (the principal period is 18.6 years, with smaller perturbations).
The other planets could, in theory, have similar effects, but I do not know if they could be measured.
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The annual change in the angle between the Earth's axis and the direction of the Sun is NOT due to a 45 degree annual change in the tilt. It is simply due to the fact that we have moved 180 degrees on our orbit between the two measurements (June solstice to December solstice). Earth's axis still points in the same direction (near Polaris) six months later.
2007-11-09 02:18:01 · answer #2 · answered by Raymond 7 · 1⤊ 0⤋
the axis about which the earth rotates shifts 23.5 degrees toward the sun and then away from the sun for a total shift of 45 degrees
2007-11-09 02:17:13 · answer #3 · answered by minorchord2000 6 · 0⤊ 0⤋
the axis rotation gives us day and night so reversing it would change the sunrise to the west. reversing the rotation the earth makes around the sun would NOT change the sunrise direction... It would be interesting :) The tides would change, the weather and wind direction, not to mention the forces on the continental plates... earthquakes and volcanoes would go nuts...
2016-04-03 03:42:36 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Definitively. The angle relative to the spin axis of the Earth changes continually as the Earth increases mass and Orbit radius as well. Time inreases as the mass of the Earth increases.
The present angle relative to the spin axis(the poles) is called the Angle of precession (aprox.84600 sec of Angle). It Changes very very slowly as Time goes by. the Angle of precession determines changes of Global temperature. Right now we are in a period of Gobal increase of temperature.
This increase in global temperature has been discovered by Al Gore.He got the Nobel prize for that..
2007-11-09 02:41:55 · answer #5 · answered by goring 6 · 0⤊ 0⤋
YES it does then how come the light goes off the dark appears how does it happen it hapens with time time s wht we need in this world to know if the eart is rotating with time :)
2007-11-09 02:16:41 · answer #6 · answered by Aykut O 2 · 0⤊ 0⤋
Yes, Polaris is the pole star, 20,000 years from now Thuban will be the pole star.
2007-11-09 03:06:51 · answer #7 · answered by spacery 3 · 1⤊ 0⤋
it changes between 22.5 degrees and 24.5 degrees but because of the gravitational pull in reference to the magnetic poles that is the extent
2007-11-09 02:10:17 · answer #8 · answered by rack922 2 · 0⤊ 0⤋
yes
2007-11-09 02:09:37 · answer #9 · answered by Anonymous · 0⤊ 1⤋
so they say, no one has been alive long enough to experience it, but they say it's true.
2007-11-09 02:09:43 · answer #10 · answered by essentiallysolo 7 · 0⤊ 0⤋