Why isn t there a total solar eclipse on the first day of the new year?

Experts from the National Astronomical Observatories of China explained that more than 300 years is the time when a total solar eclipse was observed again at a fixed location. Specifically, when a total solar eclipse occurs, it will project a total solar eclipse shadow band on the Earth, which is very narrow and only about 200 kilometers wide. This time, Hangzhou is located within the shadow zone of the total solar eclipse, and the next time Hangzhou enters the shadow zone of the total solar eclipse, it will not be until 2309, 300 years later.

Generally speaking, it takes an average of 370 years for a point on Earth to enter a total solar eclipse shadow zone.

As for saying that tomorrow's total solar eclipse will occur once in 500 years, this statement is based on the history of total solar eclipse observation in China. According to records, in the 495 years from 1814 to 2309, tomorrow's total solar eclipse will be the longest total solar eclipse in China, lasting more than 6 minutes. It can be said that such a "high-quality, long-term" total solar eclipse did not occur in the first 200 years, and it will not happen in the next 300 years.

Therefore, it is indeed rare to see it in 500 years.

In fact, there can be up to 5 solar eclipses per year around the world. If it doesn't fall once out of 5, then it must be a partial solar eclipse every time. In addition to this, there are at least two solar eclipses per year on Earth.

A total solar eclipse occurs about every year and a half. And some people spend their entire lives without being able to see a single eclipse at their doorstep.

A total solar eclipse refers to the fact that the sun, moon, and earth are three celestial bodies that happen to move very close to a straight line at a specific time, once every 300-500 years, and not every month.

This is because the plane of the white and the plane of the ecliptic will have an angle of about 6°.

Children, have you ever observed a solar eclipse? There is a certain law in the occurrence of solar eclipses, which cannot be seen every day, and must be completed under certain astronomical conditions, so let's take a look at it together.

A solar eclipse will only occur when the Moon is halfway between the Sun and the Earth and aligns in the same straight line. This condition is only available when the Moon meets the Sun, that is, at the New Moon (the first day of the New Moon), when the Sun is located at one of the two points of intersection of the Moon's orbit and the ecliptic (the plane of the Earth's orbit around the Sun), that is, at one of the two points at which the Moon cuts the ecliptic. This is why a solar eclipse only occurs at the beginning of the moon's new cycle.

So-called"food"It refers to the astronomical spectacle in which a celestial body is completely or partially obscured by another celestial body or its dark shadow. There are three main types of solar eclipses: total solar eclipses, partial solar eclipses, and annular solar eclipses. Solar eclipses occur on the principle that parts of the Earth are obscured by the shadow of the moon.

The eclipse must occur on the New Year's Day, the first day of the lunar calendar. This is because only on that day will the Moon appear on the line between the Sun and the Earth, so that it is possible for the Moon to block the Sun and form a solar eclipse.

Why isn't there a solar eclipse on the first day of every month, and why isn't there a lunar eclipse on the fifteenth day of every month? This is because apart from the above conditions, there are several other factors that influence the occurrence of solar and lunar eclipses. We call the Earth's orbit around the Sun the Yellow Channel, and the Moon's orbit around the Earth as the White Channel.

The plane of the ecliptic is not the same as the plane of the white plane, and there is an average angle of 5°09 between them, which can change at any time. A solar eclipse occurs only when the Moon orbits near the ascending and descending nodes of the ecliptic and white paths.

As we all know, the sun shines, but the earth and the moon themselves do not, and the moon is silvery white by reflecting the sun's rays. The moon revolves around the earth, and the earth revolves around the sun with the moon revolving around it. The diameter of the Sun is about 1.4 million kilometers, which is about 400 times the diameter of the Moon at 3,500 kilometers.

However, the average distance between the Moon and the Earth is only about 380,000 kilometers, which is roughly 1/400th of the average distance between the Sun and the Earth. Therefore, the apparent diameter of the Sun (the solar wheel) is almost the same as the apparent diameter of the Moon (the lunar wheel), both of which are 32'. However, since both the Moon and the Earth orbit are elliptical (the Earth and the Sun are located at the focal point of the lunar and Earth orbital ellipses, respectively), the Sun-Earth and Moon-Earth distances will vary slightly.

On the other hand, the lunar calendar is formulated based on the changes in the phases of the moon. The moon phase is the shape of the moon that one sees illuminated by the sun. The cycle of the moon's phase change is days, called synodic months, which are the average length of a lunar month.

When the moon moves between the sun and the earth (the three are not necessarily in a straight line), towards the earth is the unilluminated hemisphere of the moon, that is, the invisible black moon, which is astronomically called the new moon, that is, the new moon, which corresponds to the first day of the lunar calendar. When the moon moves in the opposite direction of the sun, that is, the earth is between the sun and the moon, people see the hemisphere illuminated by the sun, which is the full moon, also known as wang, which corresponds to the fifteenth and sometimes sixteenth of the lunar calendar.

If the Earth's orbit around the Sun and the Moon's orbit around the Earth are in the same plane, then a solar eclipse occurs when the Moon moves between the Sun and the Earth on the first day of the lunar calendar. On the fifteenth or sixteenth day of the lunar calendar, the earth is in a straight line between the sun and the moon, which will cause the moon to be in the shadow of the earth, and a lunar eclipse will occur. However, in fact, the earth and lunar orbits are not on the same plane, but are inclined to each other at an angle of 5o9', so in general, solar or lunar eclipses that occlude each other will not occur on the new day and the sun.

A solar eclipse occurs only when the moon moves near the boundary between the plane of the earth's orbit and the plane of the moon's orbit on the new sun, and the sun, moon and earth are exactly or nearly in a straight line. Similarly, a lunar eclipse occurs when the Moon moves near the boundary between the lunar and the earth's orbit while looking at the sun. This is why not all lunar eclips occur on the first day of the new year and lunar eclipses on the fifteenth or sixteenth of all lunar eclips.