The sun moves all the time. Motion is relative. For example, you could be sitting still, yet you are still moving in relation to the moon or the sun or any other outside body. The sun moves in relation to the galaxy and to the universe.
2007-03-07 17:48:47
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answer #2
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answered by gleemonex69 3
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Although only 6, 7 and 8, apply here, here is a list of motions on the earths surface.
1. CONTINENTAL DRIFT
The continental land masses sit on enormous slabs of rock that slide' over the basaltic ocean floor very slowly, at the rate of 1 to 8 in. per year. Many geologists believe that all of earth's land broke away from one supercontinent, called Pangaea, about 230 million years ago. North America is gradually moving westward, away from Europe, at the rate of 3 in. per year. As a result, the Atlantic Ocean is now 120 ft. wider than it was when Columbus sailed it in 1492.
2. EARTH'S ROTATION ON ITS AXIS
Daily rotation is the only motion of the earth that all of us can observe directly, simply by watching the sun or moon rise or set. In each 24-hour rotation, the earth revolves at 1,035 mph, as measured at the equator. However, the friction of the ocean tides against the earth's surface has been slowing our planet's rotation by l/l Coo second per century. Thus, 2 million years ago, when our distant ancestors were alive the earth's slightly faster rate of rotation made their day 20 seconds shorter than ours.
3. PRECESSION OF THE EARTH'S AXIS
Because it bulges slightly at the equator, the earth moves like a spinning top as it responds to the gravitational pulls of the sun and the moon. This spinning motion, called precession, causes the North Pole to trace a circular path which takes 26,000 years to complete. As Id North Pole moves along this path, the earth's orientation to the stars constantly changes, so that by 14,000 A.D. the star Vega will have replace Polaris as the North Star.
4. POLAR VARIATION
The earth rocks vary slightly with relation to the North and South poles, making the position of each pole wander in a circle with a 10-to-50-ft. diameter. Called the Chandler Wobble, after the Massachusetts businessman who discovered it, the poles' motion may result from movements of the atmosphere. The Chandler Wobble shifts any given latitude - the imaginary lines measuring the distance toward or away from the equator—by several feet during its cycle of 14 months.
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5. EARTH’S REVOLUTION AROUND THE SUN
The earth is following it’s elliptical orbit around the sun at 19 mi. per sec., or 68,000 mph. Astronomers define various types of years, but our familiar one is the tropical year, based on the seasons. Lasting 365 days, 5 hr., 48 min., and 46 sec., the tropical year is the time between the sun's passage through two spring equinoxes (e.g., Mar. 21,1981, to Mar. 21, 1982). The fact that the tropical year does not contain an exact number of days has required the invention of leap year.
6. MOTION OF THE SOLAR SYSTEM THROUGH THE GALAXY
With respect to the neighboring stars in this area of the Milky Way galaxy, the sun and its solar system are zooming along at 12.4 mi. per sec. (43,200 mph) in the direction of the star Vega in the constellation Lyra.
7. REVOLUTION AROUND THE CENTER OF THE GALAXY
Our solar system is located in one of the Milky Way's spiral arms, two thirds of the distance from its central core. It is revolving around the galaxy's center at a velocity of 155 to 185 mi. per sec., in the general direction of the constellation Cygnus. Every 225 million years the solar system completes one revolution, called a cosmic year, and thus far the earth has passed through 25 cosmic years. Only one galactic year ago, the first small dinosaurs were evolving.
8. THE GALAXY'S MOTION THROUGH THE UNIVERSE
Recent measurements of variations in the universe's background radiation indicate that the Milky Way galaxy and neighboring galaxies are hurtling through space at 375 mi. per sec., or 1.3 million mph. When the earth's other motions are taken into account, the earth has a net motion of 250 mi. per sec., or 900,000 mph, in the direction of the Constellation Leo.
2007-03-07 18:41:50
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answer #5
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answered by Walking Man 6
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