What is the principle of the Earth s revolution Definition of the Earth s revolution

Characteristics of the Earth's revolution.

Just as the rotation of the earth has its own unique regularity, the rotation of the earth also has its own laws. These laws range from the Earth's orbit, the Earth's orbital plane, and the yellow-red angle.

The cycle of the earth's revolution and the speed of the earth's revolution are manifested in several aspects.

1.Earth's orbit and direction.

In the process of the earth's revolution, each point on the route is on the same plane, and it forms a closed curve. This closed curve of the Earth's revolution is called the Earth's orbit. If we think of the Earth as a point of mass, then the Earth's orbit actually refers to the orbit of the Earth's core.

Strictly speaking, the median position of the Earth's revolution is not the center of the Sun, but the common center of mass of the Earth and the Sun.

Not only is the Earth revolving around that common mass center, but the Sun is also revolving around that point. However, the sun is the solar system.

The Earth is nothing more than an ordinary planet in the solar system. The mass of the Sun is the mass of the Earth.

330,000 times, the center of public mass of the Sun and Earth is only 450 kilometers from the center of the Sun. This distance is insignificant compared to the radius of the Sun of about 700,000 kilometers, and even smaller compared to the distance of hundreds of millions of kilometers from the Sun and the Earth. Therefore, the rotation of the earth is regarded as the movement of the earth around the sun (center), which is very close to the actual situation.

The shape of the Earth's orbit is an ellipse that is close to a perfect circle, and the Sun is located on one of the focal points of the ellipse. The ellipse has a semi-major axis.

Elements such as the semi-minor axis and the semi-focal length are represented by a, b, and c, respectively, where a is the distance between the two ends of the minor axis from the focal point (f1, f2).

There is such a relationship between the half focal length and the semi-major axis and the flat and minor axis:

i.e. c2=a2-b2

The ratio of the semi-focal length c to the semi-major axis a, c a, is the eccentricity of the ellipse.

Expressed by e, i.e. e=c a, eccentricity is a quantitative representation of the shape of an ellipse, and the value of e is greater than 0 and less than 1. The closer the ellipse is to the circle, the smaller the value of e, i.e., close to 0; Conversely, the flatter the ellipse, the greater the value of e. It has been determined that the semi-major axis A of the Earth's orbit is 149,600,000 km, and the semi-minor axis B is 149,580,000 km.

From this data, the eccentricity of the Earth's orbit is calculated as:

It can be seen that the Earth's orbit is very close to a circle.

Since the Earth's orbit is elliptical, the distance between the Sun and the Earth changes as the Earth revolves around the Sun. The closest point in the Earth's orbit to the Sun, that is, the end of the long axis of the elliptical orbit closer to the Sun, is called perihelion. In modern times, the date of the Earth's perihelion is around the beginning of January every year.

At this time, the Earth is about 147.1 million kilometers from the Sun, which is commonly known as perihelion. The farthest point in the Earth's orbit from the Sun, the far end of the long axis of the elliptical orbit from the Sun, is called the aphelion.

In modern times, the date of the aphelion of the Earth is about the beginning of July every year. At this time, the Earth is about 152.1 million kilometers from the Sun, which is often called aphelion. The average of both perihelion and aphelion.

is 149600000 km, which is the average distance between the Sun and the Earth, that is, 1 astronomical unit.

4. The revolution and rotation of the earth.

From west to east! Orbiting the sun!

Physical Geography - Revolution of the Earth (Part II).

Quite simply, the Earth moves in a near-circular motion with the Sun as the center.

The earth revolves. It means that the earth revolves around the sun in a certain orbit. Simply put, it is the near-circular motion of the earth around the sun.

The cycle of the Earth's revolution is one year. There are two cycles of the Earth's revolution, which are the return year and the sidereal year.

The return year refers to the time interval between the two consecutive passes of the sun through the vernal equinox, that is, the time elapsed by the sun's center from west to east along the ecliptic from the vernal equinox to the vernal equinox, also known as the solar year. 1 return year is a day, or 365 days, 5 hours, 48 minutes and 46 seconds.

A sidereal year is a true cycle of the Earth's revolution, during which the center of the Earth starts from a point in the sky, orbits the Sun, and then returns to that point; If viewed from the Earth, it is the center of the Sun that cuts off the celestial sphere from the ecliptic (the plane of the Earth's orbit.

The resulting circle) departs from a certain point (a certain star) and runs on the week.

And then back to the same point (the same star). During a sidereal year, it takes about 365 days, 6 hours, 9 minutes and 10 seconds for the Earth to orbit 360°.

The earth revolves.

The characteristics of the Earth's revolution are as follows:

1. Revolution is the circular motion of an object centered on another object along a certain orbit, the direction of revolution is from west to east, its orbit can be a circle, ellipse, hyperbola or parabola, and a larger scale of celestial bodies around the motion, in different reference frames, different perspectives, there will be two directions of rotation counterclockwise and clockwise.

2. The earth is a planet in the solar system, according to the distance from the sun from near to far, it is the fifth planet, the speed of the earth nearly 30 kilometers and seconds revolves around the sun, the earth moves around the sun in a circular orbit, the average distance from the sun is about 100 million kilometers, 365 days, 6 hours, 9 minutes and 10 seconds revolution, this is a year on the earth.

3. The movement of the earth around the sun, the direction of the earth's revolution is from the winter solstice through the spring equinox to the summer solstice to the eastward and then to the north-east 23°26 and then to the east, from the summer solstice through the autumn equinox to the winter solstice to move eastward and then to the south-east 23°26 and then eastward, and the cycle repeats.

4. With perihelion and aphelion, the time required for one revolution is one year, about a day, the rotation speed is faster at perihelion, and slower at aphelion, the earth's revolution produces seasonal changes in the alternation of four seasons, and the average angular velocity of the earth's revolution is about 1 degree per day.

The earth revolves. The geographical significance is as follows:

1. Changes in the height of the sun at noon. The Earth's revolution is such that the height of the Sun at noon is from the point where the Sun shines directly.

The latitude of the place is gradually decreasing in the north-south direction;

2. Changes in the length of day and night. Due to the movement of the point where the sun shines directly, the position of the sun directly on the surface is also different;

3. The formation of the four seasons. The rotation of the earth forms the change of the seasons;

4. Five belts. of the formation. The rotation of the earth gives rise to five zones, namely the tropics, the northern temperate zone, the southern temperate zone, the northern cold zone, and the southern arctic zone.

The cycle of the Earth's revolution.

There are two distinct cycles in the process of the earth's revolution, namely the return year and the sidereal year, the return year refers to the time interval between the sun passing through the vernal equinox twice in a row, that is, the time experienced by the sun center from west to east along the ecliptic from the vernal equinox to the vernal equinox, also known as the solar year. 1. The return year is a day, that is, 365 days, 5 hours, 48 minutes and 46 seconds. This is based on the average of 121 regression years.

The result of the calculation.

The earth revolves. Definition: The earth rotates around the sun in a certain orbit (theearthrevolutionaroundsun).

Just as the rotation of the earth has its own unique regularity, the rotation of the earth due to the action of the sun's gravitational field and rotation also has its own laws.

The rotation of the earth follows the orbit of the earth, the orbital plane of the earth, and the angle of yellow-red junction.

The period of the earth's revolution, the speed of the earth's revolution and the effect of the earth's revolution. The time it takes for the earth to revolve is one year. There are two distinct cycles in the process of the Earth's revolution, which are the return year and the sidereal year, and the time of the return year is not the same as the sidereal year.

The one-year time difference between the two is called precession.

Every point in the Earth's orbit is on the same plane, and this plane is the Earth's orbital plane. The Earth's orbital plane behaves as an ecliptic plane on the celestial sphere.

It is on the same plane as the flat chain surface where the sun's annual apparent motion route is located. The rotation and revolution of the earth are carried out at the same time, and on the celestial globe bridge, the rotation is represented by the celestial axis and the celestial equator, and the revolution is represented by the yellow axis and the ecliptic. The celestial equator is on one plane and the ecliptic is on the other, and the plane where these two concentric circles are located forms an angle of 23°26, which is called the yellow-red angle.

1. The regression motion of the direct point of the sun.

2. The length of day and night changes.

3. The change in the height of the sun at noon.

4. The four seasons are resistant to talk about the division of the five belts.

The earth's revolution refers to the earth's rotation around the sun in a certain orbit. Just as the rotation of the earth has its own unique regularity, the rotation of the earth due to the gravitational field and rotation of the sun also has its own rules.

The rotation of the earth follows the laws of the earth's orbit, the earth's orbital plane, the yellow-red angle, the period of the earth's revolution, the speed of the earth's revolution and the effect of the earth's revolution. The time it takes for the earth to revolve is one year. There are two obvious cycles in the transition of the Earth's revolution, namely the return year and the sidereal year, and the time of the return year is different from the sidereal year.

The one-year time difference between the two is called precession.

The return motion of the point where the sun shines directly.

The length of the day-and-night type is changing.

The height of the sun at noon is changing.

The four seasons and the five zones are divided.