Motion of the Earth :: physics earth spin

The Earth gos around an axis. The Earth takes (a bit more than) one day to go around once. This axis is pointing off somewhere in space. This axis (mostly) doesnt move. At the same time, the Earth is orbiting the Sun. It takes (a bit more than) one social class to go around once. The plane of the Earths orbit (mostly) doesnt move. The spin axis of the Earths daily rotation is not erect to the plane of the Earths orbit.It is tipped (approximately) 23.4 degrees. The angle of tilt (mostly) doesnt change.Earth does not spin perpendicular to the plane it is tilted, the reason earth is tilted is because it got hit by meteoroids and other stuff when the planets first formed.Also it takes virtually 24 hours for one period of earth rotate. From that we get sunlight, half of our days.We can imagine easily how fast earth is spinning by 2R(radius of the earth)/24 hours. but that is just speed of the equator of the earth. We have different spinning speed any different latitude.As we could see from above picture every latitude have different speed of spinning per hour. And speed of the earth spinning could action on such as water reservoirs.We dont feel that because everything else is moving with us and because the motion is very, very smooth.Changes in the Earths spin are measured in hurt of length of days. A faster spin shortens the length of daylight. Due to the reservoir effect, (Chao). the day 40 years ago was longer than today by about 8 millionths of a second. More significant, he said, is the fact that the sporadic spacing of water reservoirs has changed the Earths axis. Since 1940, water impoundment has pushed the axis of rotation about 60 centimeters away(p) from the North Pole toward western Canada, said by ChaoAlso it effect on the direction of the wind and movement of the clouds. Stars and planets form as a response of the gravitational collapse of accreting material. Any net translational motion of that initial material is accelerated as its radius of rotation decreases. Once an initial spin was established for the Earth, the same conservation principle says that its angular momentum will continue unless it can be transferred to another object. With no significant frictional forces to set aside that to happen, the Earth can continue to spin indefinitely without any further prodding said by Paul Walorski.