How the number of days in a year in the Gregorian calendar coincides with the Earth s cycle of seaso

The number of days in a year in the Gregorian calendar is the time for the earth to circle the sun, and the earth's circle around the sun is also a cycle of alternating seasons, and it is inevitable that they are the same.

It is calculated based on the fact that the earth revolves around the sun for one year. It takes a little more than 365 days and 5 hours for the Earth to revolve around the Sun.

Notes on some information:

The lunar calendar is also called the lunar calendar. The lunar year is 354 days, which is calculated according to the month when the moon orbits the earth. The lunar year is sometimes 12 months and sometimes 13 months. The year with a leap month is 13 months.

The Gregorian calendar is also called the Gregorian calendar. The year of the solar calendar is 365 days, which is calculated based on the rotation of the earth around the sun as a year. It takes a little more than 365 days and 5 hours for the Earth to revolve around the Sun.

The solar calendar (365 days a year) has more than 11 days per year than the lunar calendar (354 days a year), and in order to avoid the months of the solar calendar and the lunar calendar getting bigger and bigger, leap months are used to make up for it. There are 7 leap months in 19 years. Generally, it is the beginning of spring before the Spring Festival of the lunar calendar, and there is no leap month in the second year.

After the Spring Festival and the beginning of spring, there will be a leap month this year.

The months of the year in the solar calendar are 31 days and 30 days. February is generally 28 days. February 4 has a 29-day day.

The reason why there is an extra day is because the solar calendar has more than 365 days and 5 hours a year, and there will be an extra day in almost 4 years. As for the 29 days of February of that year, you only need to divide the year by 4, and the February of the year with no remainder is 29 days. For example, in 2004, divided by 4 and there is no remainder, then February of this year must be 29 days divided by 4, and February in these three years must be 28 days.

Why is February 28 days in the Gregorian calendar? This is when ancient Rome formulated the calendar, when it first envisaged that the odd number of months would be 31 days, and the even number would be 30 days. But such a year is 366 days, which is one more day than 365 days, and one day must be picked out of 12 months.

Because in ancient Rome, executions were carried out in February, so they all considered this month unlucky, so one day from February was cut out, and it became 29 days. At that time, the Emperor of Rome was born in August with 30 days, one day less than the previous emperor who was born in July with 31 days. He took another day from February and added it to August.

Since then, February has become 28 days in the solar calendar, and August, which was supposed to be 30 days, has become 31 days.

The change of the seasons throughout the year is evidence of the revolution of the earth.

Evidence of the Earth's Revolution:

1. The polar day and polar night phenomena alternate in the north and south poles.

2. The four seasons change.

3. Periodic changes in the latitude of direct sunlight.

4. Astronomers have discovered that all other large planets in the solar system revolve around the sun, and the earth is no exception 5. Kepler's law.

6. Newton's calculus elliptic orbital proof.

7. The length of day and night changes in the short cycle.

8. At the same time and place in different days, others and I found the sun in different directions.

The movement of the earth around the sun is called the revolution of the earth. Because the earth circles the sun along with other celestial bodies in the solar system, the sun is the central celestial body they share, so it is called "revolution". The direction of the Earth's revolution is from west to east, and the time it takes to complete one revolution is one year.

Phenomena arising from the revolution of the Earth:

1. Changes in the length of day and night.

2. The replacement of the four seasons of spring, summer, autumn and winter.

3. The change in the altitude angle of the sun at noon.

4. The division of five zones (tropical, north-south temperate zone, north-south cold zone).