Ask Sidereal Day Solar Day Question, What is the difference between sidereal day and solar day?

A solar day may be referred to as a sidereal day, and sidereal days include solar days. They are relationships.

There should be a wow-wow-writing time for the solar day and sidereal day in the high school book.

We wrote it back then.

The 1st floor is yes, the 2nd floor is not right!

A sidereal day is a reference to a distant star. The angle of the star you are looking at now is not turned to 360° when you see it at the same angle the next day, it is already a sidereal day, (you can refer to the atlas to think about it) that is.

23h56min4s。This is a sidereal day.

The solar day is a position where the sun shines directly on the earth, and then it shines directly on it the next day, that is, the earth's rotation is 360°. It's a solar day.

Since the length and name of the day vary slightly depending on the selected reference point when calculating the rotation period, the Earth's rotation has two more cycles, the sidereal day and the solar day.

The Earth rotates 360° in 23:56:4. This is called a sidereal day, which is the time interval between a star in the sky (a star that is far from the Earth, which is considered immobile by people on Earth, regardless of the Earth's revolution) twice in a row. This is the true cycle of the Earth's rotation.

A 24-hour day, when the sun passes through the upper midheaven twice in a row. Since the Earth rotates while revolving around the Sun, one solar day rotates 360°59', which is 59' longer than the sidereal day, so the time is 3 minutes and 56 seconds longer than the sidereal day.

Note: Celestial bodies pass through the plane of the meridian circle where the observer is located twice a day, and the one that is closer to the celestial setting is called the middle heaven.

First, the meaning is different: Pi Song.

Solar day. It is the sun passing through the same meridian twice in a row.

time intervals.

A sidereal day is the time interval between a meridian facing the same star twice.

2. The number of leap years in ordinary years is different.

1. Sidereal days: There are 366 sidereal silver dust days in a normal year; A leap year has 367 sidereal days.

2. Solar days: There are 365 solar days in normal years; A leap year has 366 solar days.

Third, the basis is different.

1. The solar day is based on the movement of the sun, and the time defined can be divided into the front grip meditation sun day and the peaceful solar day.

2. The sidereal day is based on the movement of the stars, and the sidereal day is the rotation period of the earth.

Calculation method:Solar day = 23 hours, 56 minutes, 4 seconds plus +24 hours sidereal year = 24 hours. A sidereal day is the Earth's rotation period. The earth revolves.

As a result, the sidereal day is one more day than the solar day, so the sidereal day of the return year is 366 days.

Since the Earth's revolution around the Sun is counterclockwise, the rotation of 360° cancels out the 360° of the solar day (a sidereal day), so there is an extra sidereal day every year. So there are 366 sidereal days and 365 solar days in a common year. A leap year has 367 sidereal days and 366 solar days.

The above content reference: Encyclopedia - Sidereal Day.

The solar day is the rotation of the earth around the sun, and the sun is the frame of reference. Because the rotation of the earth around the sun is against the spring to amuse the hour hand, so the angle of the earth's rotation on the solar day every year is offset by the revolution by 360°. Solar day = sidereal day + Earth's orbital angle (, 3 minutes 56 seconds).

The sidereal day does not revolve around the star, but the time it takes for the Earth to rotate 360° (23:56:4).

The solar day is the rotation of the earth around the sun, and the sun is not a frame of reference. Because the rotation of the earth around the earth is counterclockwise, the angle of the earth's rotation on the solar day is offset by the revolution by 360° every year. Solar day = sidereal day + Earth's orbital angle (, 3 minutes 56 seconds).

The sidereal day does not revolve around the star, but the time it takes for the Earth to rotate 360° (23:56:4).

1. Sidereal day: The time interval between the meridian facing the same star twice. The sidereal day is the period of 360 degrees of rotation of the Earth's vertical ball, which is 23 hours, 56 minutes and 4 seconds. To put it simply, a sidereal day is the period of the Earth's rotation.

2. Solar day: that is, a day and night. The time interval between the sun passing through the same meridian twice in a row is called a Taidou Zhengyang day, because the earth is rotating around the sun at the same time, and it takes 24 hours for the earth to rotate in one solar day.

1. Sidereal day: The time interval between the meridian facing the same star twice. A sidereal day is the Earth's 360-degree rotation from its erection to 23 hours, 56 minutes and 4 seconds. To put it simply, a sidereal day is the period of the Earth's rotation.

2. Solar day: that is, a day and night. The time interval between the two consecutive passes through the same meridian is called a solar day, because the earth is rotating around the sun at the same time, and it takes 24 hours for the earth to rotate in a solar day.

The sidereal day is based on the infinite distance of the star, and the solar day is based on the solar debate. A sidereal day is the time interval between two meridians facing the same star, and a solar day is the time interval between two consecutive passes of the Sun on the same meridian. The difference between the two is that the Earth rotates around the Sun at the same time.

How a sidereal day differs from a solar day

The number of leap years in common years varies, with sidereal days having 366 sidereal days in a normal year and 367 sidereal days in leap years. There are 365 solar days in a normal year and 366 in a leap year.

Depending on the basis, the sidereal day is based on the movement of the stars, and the constant judgment is the rotation period of the earth. The solar day is the time defined according to the movement of the sun, which can be divided into the apparent solar day and the peaceful solar day.

The definition is different, the solar day is a day and night, the time interval between the sun passing through the same meridian twice in a row, called a solar day, because the earth is rotating around the sun at the same time, a solar day, the earth needs to rotate for 24 hours. The sidereal day is the time interval between the meridian two opposite to the same star, and the sidereal day is the period of the earth's rotation of 360 degrees, which is 23 hours, 56 minutes and 4 seconds, which simply means that the sidereal day is the period of the earth's rotation.

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Analysis: The difference between a sidereal day and a solar day is that the target is different, the former is calculated with the star as the target, and the latter is calculated with the sun as the target, which is the crux of the problem.

The earth is constantly rotating, and at the same time revolving around the sun, and the celestial bodies rise in the east and set in the west, which is actually the phenomenon of the earth's rotation. The cycle of the Earth's rotation, that is, the cycle of the celestial bodies moving on Sunday. The Sun and other stars do not have the same period on Sunday, so there is a difference between the solar day and the sidereal day during the rotation of the Earth.

Sidereal day: When the Earth is located at E1, pay attention to E1, point P and a distant star point A are on a straight line, when the Earth rotates 360°, that is, from E1 to E2, the position of A seems to have reached point B, (actually not moving, because it is too far away) at this time E2, P and B points are still on the straight line, this time is a sidereal day, this time is the real cycle of the Earth's rotation, the time interval (that is, the time between E1, P, A and E2, P, B) is 23 hours, 56 minutes and 4 seconds. Solar day.

When the earth rotates one week, from e1ps to e2ps, the required time interval is 24 hours, called a solar day, the solar day is not the real cycle of the earth's rotation, but the time interval between the sun passing through the same meridian plane twice in a row, because the earth rotates at the same time, it takes 23 hours, 56 minutes and 4 seconds to rotate for one week, and it takes 3 minutes and 56 seconds to rotate for 59 seconds, and the time, the time used for rotation plus revolution is 24 hours, So a sun is 3 minutes and 56 seconds longer than a sidereal day (about 4 minutes).