why does earth revolve round the sun?and why does it revolve in elliptical path?
464601
Earth revolves around the sun because the giant nebula out of which the solar system formed was spinning and the angular momentum is conserved, and earth spins because of the initial config. Why it revolves in an ellipse, see this\nexplanation at http://www.mathsnet.net/cabri/feynman.html
110477
If the question is about precession, then wikipedia has an answer:\n\n(The earth's axis undergoes a change in the direction of its axis, very slowly though...it spins like a wobbling top, and if you extend the axis up to the heavens and plotted it over 26000 years, it would trace a small circle in the sky. This is known as precession.)\n\n"The explanation of this is: The axis of the Earth undergoes precession due to a combination of the Earth's nonspherical shape (it is an oblate spheroid, bulging outward at the equator) and the gravitational tidal forces of the Moon and Sun applying torque as they attempt to pull the equatorial bulge into the plane of the ecliptic. The portion of the precession due to the combined action of the Sun and the Moon is called lunisolar precession."\n\nLook up the article in wikipedia with the provided link and you'll have a more detailed explanation along with a detailed diagram (2nd link) showing the circle it traces in teh sky... You can see by the diagram that Polaris will/was not always the north star. At different periods of the earth's history, other stars assumed that role or there was no north star.
64853
First of all the world is not round it is an oblique sphereoid (basically a double ended pear shape.)\n\nThe force of gravity generated by the molten core of the planet acts in all directions equally at any one point in the planet.  This attracted the material from space that formed earth following the Big Bang.  This would form a spherical object.\n\nThe rotation of the planet complicates thia as the equator is rotating faster than parts of the Earth that are further away from the equator, the poles rotate the slowest.  This disparity causes greater centripidal forces to be experienced at the equator than at the poles so the earth bulges out at the centre.
202841
The equinox is defined as the point where the sun is directly overhead on noon at the equator.  This is very close to when the days and nights are equal, and if the earth traveled around the sun in a perfect circle, they would be the same.\n\nBut the earth travels around the sun in an elliptical path.  Sometimes it is closer to the sun, travelling more quickly, and other times it is further away, travelling more slowly.  This introduces small discrepancies in the length of the day.
479647
the tilt of the earth and when it revolves around the sun
56922
To be very precise, this is what happens:\n\nAs we are attracted towards the sun by the force of sun's gravity, we continously experience a constantly increasing force, beacuse of the inverse-square law.\nAnd due to this, our momentum is continously increasing.This increase in the momentum causes a centripetal and a centrefugal force on th earth, which results into a hellical orbit.But due the inverse-square relationships, the horizontal component of the helix is nullified as soon as the earth achieves its stability, so it revolves around the sun, without crashing into it.\nAt this point, all of sun's gravitational pull equates mv^2/r, which in tuen accounts for all the centripetal force of the earth.SO, THEREFORE, NO EXCESS FORCE PULLS THE EARTH FURTHER TOWARDS THE SUN, SINCE ALL OF THE FORCE IS EXPENDED IN MAKING IT REVOLVE.
450708
I guess it's time someone writes down a correct answer...\n\nThe earth rotate on its axis, which runs through the north and south poles.  It so happens that the earth's axis is not perfectly vertical.  Because the axis is at an angle, we spend half the year (it changes during the equinox) with the north pole (and hence the northern hemisphere) tilted towards the sun - this is summer.  We spend the other half of the year with the south pole tilted towards the sun (hence, the northern hemisphere is tilted away from the sun) - this is the winter.  Now I will leave it up to you to think about why this should make the summer days longer than the winter days.  Try this:  grab a basketball (better yet, a globe), turn off all the lights, point a flashlight at it and spin it with the axis rotated towards the light and with the axis rotated away from the light.  Follow a single point on the top half of the ball and see if you can make sense why this point stays in the light longer when the axis is pointed towards the light versus when the axis is pointed away from the light... \n\nIt's a nice point to make that in the southern hemisphere (Australia, Chile, South Africa, etc.) the days are longer in the winter and shorter in the summer.  If you think for a moment, it shouldn't be too hard to figure out why...
1184111
hey buddy! hello.\nwe all know that the earth rotates around the sun and also on its own axis. we also know that an imaginary line divides the earth into 2 equal halves. this line is the equator. the upper part is the north side and the lower is the south side. the axis of the earth does not run perpendicularly, but is tilted at an angle of about 16 degrees (if i remember it correctly)\n\nnow, as the earth rotates simultaneously on its axis and around the sun, it so happens that sun rays fall on one side that is either on north or on south side for continuous 6 months. this means that there is day for continuous 6 onths on one side and night on the other. so, it totaly depends that at what time of a year you r comparing both the poles temperature. if you compare the temperature of the 2 sides in the month of june, north pole will be hotter and south pole will be cooler. opposite happens during december and january. \nat a certain time it may also happen that temperatures of both the poles are same! this may happen at the time of transit. that is when sunshine is equal to both the poles!\n\nhope i have answered u.\n\ngood luck.
442630
this planet revolves around the sun ,which is a very powerfull all influencing movement.\nall life follows this path.\n\nall spirals in Nature turn anti clockwise.\nthe bean,or vine that winds its way up a tree.\nthe bath water running down the drain,the toilet water going down the bowl,the currants, in the seas and rivers\n\nthe spiral paterns in our bones,the way branches devellop on a tree spiraling up wards in protruding branches.\nwhen you walk in the dessert your path will vere towards this direction \nand is it hard to walk in a straight line,\nmany people right feet are larger than the left,so that you will walk in this curve.\nin construction or actions involving a lot of people,i always make paths ,roadways and trafic go in the anti clock wise direction\nthis results in less congestion or accidents and it is the more natural and comfotable direction for the people .\nputting them in a better mood to work.\n\nthe twister and huricanes and tornados and wheather paterns just follow every body else\nand contrary to myth or ignorence this direction does not change if you go to the other side of the planet,this is an old wive tale.\nif you put a bath tub on the plane and slowly drain it ,the direction does not change all of a sudden when you get to Australia.
207691
Earth's orbiting around the sun & Earth's 23.5 degree tilt of axis.\n\nOn earth's orbit around the sun, there are 4 points of position that we refer to as either equinoxes(2) or solstices(2).\n\nTo begin with, a solstice is the time when on Earth the sun is either at it's lowest (winter) or highest (summer) point in the sky. An equinox is when all places on the planet experiences equal amounts of light & darkness.\n\nFor the Northern Hemisphere:\n\nWhen the Northern axis is tilted toward the sun we are experiencing the summer solstice. On that day we have the greatest amount of sunlight.\n\nNext stop is the Autumnal equinox. About 1/4 of the way in our orbit around the sun, the Earth's axis is neither pointed toward or away from the sun. All places on earth experience the same amount of daylight/night hours.\n\nAgain, 1/2 the way in it's orbit, the Earth's northern axis is tilted away from the sun so that we get the least amount of daylight hours on this particular day.\n\nAs we move on still, 3/4 of the way around the sun, we experience another equinox. This is the Vernal or Spring equinox. Again, the northern axis is neither pointed toward or away from the sun. Equal daylight/night hours occur.\n\nAs for the Southern Hemisphere: they have the opposite seasons for the very same reasons as above. It is really cool that while we are celebrating Christmas during the winter monthes that the Southern Hemisphere's Dec. 25 is during the SUMMER!\n\nDebunking some common myths (pet peeves of mine):\n\n**Myth 1**The seasons are NOT caused by the distance of Earth from the Sun. In all actuality, the earth is closest in it's orbit to the sun during the winter monthes.\n\n**Myth 2**The earth's axis DOES NOT turn as it goes around the sun! The earth turns on it's axis & the earth revolves around the sun. This combination causes us to be tilted toward or away from the sun!\n\n**Myth 3**An egg will NOT stand on end during an equinox! All eggs have differences in their surfaces which may allow any to be stood on end if you tried it long enough!
338602
There are a number of observations that prove Earth moves around the Sun. Astronomers have found that relatively nearby stars appear to move horizontally back and forth slightly over a year's time. This effect is due to a phenomenon called parallax which in turn results from Earth's movement around the Sun. Also Earth's measured movement through the cosmic microwave background radiation is consistent with our orbit around the Sun.\n\nThis website has a more complete discussion about proofs of Earth's orbit around the Sun --\n\nhttp://curious.astro.cornell.edu/question.php?number=190
463527
There is rotation-the spinning of Earth on its axis\nAnd:\nThere is revolution-The orbiting of Earth around the sun
700051
1. Eclipses, and lunar phases. \n2. The other "celestial" bodies, like the sun, moon and planets also appear round. One might assume, that the earth might be also.  \n3. Gravitational laws based on the earth being a certain shape and size, predict movement, etc. \n4. The stars in the southern hemisphere are  different than in the northern hemisphere.\nIf the earth was flat, one should be able to see the all of the stars at least some of the time. \n5. Sailors regularly circumnavagate the earth.\n6. Planes regularly fly around the world.\n7. The seasons and the climatic zones are hard to explain otherwise. \n8. The coreolis forces of hurricanes.\n\nOne can use scientific method to prove all of these and come up with conclusions for an earth that is somewhat round in shape, if one isnt lucky enough to see it from space, and believe it with your own eyes.
352683
The earth has several different movements. First, it rotates on its axis, which takes 24 hours. During this period, the parts of the earth that face toward the sun experience day, while the parts that face away from the sun experience night. Second, the earth revolves around the sun.. in a large elliptical orbit. This process takes a year. The earth's journey around the sun along with the earth's tilting axis produce the seasons. Third, the earth, sun and other planets are all moving within the galaxy, but this is on a very large scale, and is not really noticeable or of interest to most people.\n\nTo sum up:\nmovement of the earth on its axis: rotation. it takes 24 hours.\nmovement of the earth around the sun: revolution. it takes 365.24 days.
275720
It has to do with the path of the earth and the sun through space.\n\nThe websites I've attached should help.
52855
It has to do with the direction the earth rotates on its axis. It rotates once every 24 hours. So, the direction it spins is the direction the sun passes by. The earth would have to completely stop and start to rotate in the opposite direction in order for the sun to rise in the west and set in the east. Hopefully that won't happen any time soon, because it would probably mess gravity all up.
170291
The earth goes around the sun.  As it does, it is at a certain angle, it's not like straight up and down. You're either tilted away from the sun or toward the sun.  If you are tilted away, it's winter, if you're tilted toward the sun, it's summer.  If it's in between, it's fall or spring.