Why does the earth revolve around the sun on its axis?

Answer 1

The earth rotates because of residual energy associated with its formation. It might be called the inertia of formation that causes it to rotate about its axis. Let's look back at the way the earth formed.

It is believed gas, dust and other debris accreted to form the earth (and other planets) sometime after the sun formed. The accumulation of these materials was one in which the bits and pieces involved come together with some amount of kinetic energy, and this ends up causing the whole mass to "spin" or "rotate" about some axis.

The sun formed in a similar way to the planets, and it is spinning about its own axis for the same reasons. The materials that accrete to form bodies in space don't just "fall together" but "spin into" a center or gravity bringing kinetic energy with them. This causes the whole mass to end up spinning.
because the dust and debris disk around the sun that the earth formed from was rotating. conservation of angular momentum. The only answer is that there is nothing to stop it rotating the way it always has rotated.
The Earth continues to rotate today because of leftover angular momentum from its formation.

There is no force that causes the planets to rotate. Most of the rotation comes about from the conservation of angular momentum. Angular momentum is given by L=m*w*r2 where m is the mass, w is the angular velocity in radians per second, and r is the radius of the circular motion. Due to conservation of angular momentum, if the radius of the orbit decreases, then its angular velocity must increase (as the mass is constant).

All planetary and stellar systems are born from the collapse of dense interstellar clouds. The clouds may originally be very large (even thousands of light years across). Consider a portion of the cloud the collapses from a size of a light year or so to the size of the solar system. That is a huge change in the size of the system. So, the very slight rotation that the cloud has in the beginning is increased dramatically when the collapse takes place. In fact, this is one of the barriers in star formation: there is excess angular momentum and there has to be a way of losing angular momentum before you can form a star.

Anyway, the bottom line is that stars like the Sun spin from the original angular momentum that was there in the solar nebula from which it formed. Not only that, all orbital motion of the planets (including the spin) is due to this original angular momentum.

Earth, and all other planets and most celestial objects, rotate as a result of their formation. As matter accretes under the influence of gravity, the potential energy must go somewhere. It turns into kinetic energy, moving the particles together. When the particles meet and conglomerate (first due to electrostatics, then due to gravity) the kinetic energy must remain within the object as there is no way to get rid of it. It becomes rotational kinetic energy instead of linear kinetic energy, causing the object to rotate.
Earth, and all other planets and most celestial objects, rotate as a result of their formation. As matter accretes under the influence of gravity, the potential energy must go somewhere. It turns into kinetic energy, moving the particles together. When the particles meet and conglomerate (first due to electrostatics, then due to gravity) the kinetic energy must remain within the object as there is no way to get rid of it. It becomes rotational kinetic energy instead of linear kinetic energy, causing the object to rotate.
In addition to orbiting the Sun, the Earth is constantly spinning, giving us day and night as each side of the Earth points toward, then away from, the Sun. This spin also causes a "bulge" at the equator, so that locations there are about 21.3 km farther from the Earth's center than either of the poles.

How did the Earth come to be rotating, at this speed, in this direction? There are several factors that would affect this.

• Everything in the universe appears to rotate, and we know that angular momentum is conserved in every interaction, so it isn't surprising that the collapse of the original planetary nebula into the Sun and planets would have set everything spinning. It's worth noting that most things that rotate in our solar system almost all rotate in the same direction - counterclockwise as seen from a position "above" the north pole of the Sun.
• Another possible impetus for the planet's spin would have been the titanic collision between the proto-Earth and a planetoid that hit the Earth early in its history, creating the Moon from the debris. Unless the impact was precisely on center, the impact would have spun the planet like a top.
• All but two of the Sun's planets rotate as Earth does. Venus hardly rotates at all, which might have been due to a collision (as above). The planet Uranus spins somewhat normally, but is tipped over on its side, its poles alternately facing the Sun as it moves in its orbit. The larger planets rotate faster than Earth.

Conservation of angular momentum

The matter that formed Earth and the other members of the solar system was in a swirling disk of dust. The angular momentum of that mass has been conserved according to the laws of motion, and so the planets rotate around their axes as well as revolving in orbit around the Sun.

In the case of the Moon, its rotation has been influenced by tidal forces with the Earth, so that one side of the Moon always faces the Earth. This effect has also been observed in the orbit of Mercury and in objects past the orbit of Neptune.
Because there is nothing stopping it. The fact that it goes round in 24 hours is just random, it could be 12 hours or 12 days. When the Earth was formed from a cloud of particles it was naturally rotating, and the present rotation is the remnant of that.
The Earth continues to spin today because of leftover angular momentum from its formation.

The entire solar system formed when a giant rotating cloud of gas and dust collapsed under the influence of its own gravity. Most of the gas gathered in the center to form the Sun. As the matter drew together, it spun faster and flattened into a disk. There were spinning pockets of gas and dust scattered throughout this disk, and one of them would become Earth. Our planet started out as a hot molten mass and was spinning much faster when it first formed. The laws of physics say that an object in motion will tend to stay in motion unless an outside force acts on it, and that applies to Earth's rotation. The only reason Earth's rotation has been slowing down is because of drag from the Moon's gravity and impacts with asteroids.
Rotational inertia.
the earth turns so the whole world has a day and a night.
to give day and night

to let the sun be on the other side of the world and the moon be on ours

God put some spin on it when he served.
Well this is an unknown answer,But the say that its because of a metor hitting the Earth thousands of years ago.The Earth is rotating around an axis (called its rotational axis). Some objects rotate about a horizontal axis, like a rolling log. Some objects, such as a skater, rotate about a vertical axis. The Earth's axis is tipped over about 23.5° from vertical.

How do we define up and down in space? What would "vertical" mean? For the Earth, we can think of vertical as straight up and down with respect to the plane in which the Earth orbits the Sun (called the ecliptic)

Earth's rotational axis points in the same direction relative to the stars, so that the North Pole points towards the star Polaris. Think of the Earth as a spinning top, tipped over to one side. Over very long time periods (thousands of years) the direction of Earth's axis slowly changes due to precission

The Earth rotates around once in 24 hours - that's a rate of 1000 miles per hour!. The time it takes for the Earth to rotate completely around once is what we call a day. It's Earth's rotation that gives us night and day.

The combined effect of the Earth's tilt and its orbital motion result in the season

Answer 2

Bodies (like planets) become larger and larger as their materials coalesce out of the accretion disks of rubble and dust that form them, and crash into the growing body. Materials falling out of the disk don't fall directly into the body, but tend to make glancing blows, or go into rapidly decaying low orbits for a while. The disk material orbits the sun, because material that wasn't going fast enough to orbit crashed toward the sun. The orbiting material farther out from the sun is moving a little more rapidly than material between the body and the sun. So the material falling toward the body from the night side imparts more rotational energy when it hits, adding to the rotation of the body.

Answer 3

• he axis of rotation of the earth describes the line about which the globe turns. The rotation provides us with day and night. And because the axis of rotation is not perpenducular to earth's plane...

Answer 4

So the seasons can change in different hemispheres.

Answer 5

The earth is tilted 23.5 degrees. This is what creates the earths seasons. The two hemispheres (north and south) are always on opposite seasons.

Answer 6

so we can live