The total solar eclipse cycle, the five phases of the total solar eclipse are explained in detail

The same solar eclipse (total eclipse, annular eclipse and partial eclipse) will occur once every time it passes through a sarro cycle (18 years and days, that is, 6, days), but the areas that can be observed are not the same, but the time of the eclipse is the same, that is to say, if a solar eclipse occurs, a solar eclipse will occur after 18 days, but the type of solar eclipse is not necessarily the same, and the Yangtze River basin or China may not be able to see it. And because this number is not an integer, the time of occurrence is also the same, and there are three sarro cycles.

In addition, solar eclipses do not occur only once every 18 years, in fact, there are solar eclipses every year, which you can understand as having multiple solar eclipses, each of which observes its own saro cycle.

Solar eclipses are every year, generally there are two eclipse seasons every year, each eclipse season is 36 days, and each eclipse season must occur at least once, but because 36 days is greater than the lunar phase cycle), if an eclipse season contains two new days (the first day of the lunar calendar), one eclipse season can occur two solar eclipses, so that theoretically up to 4 solar eclipses can occur per year, in fact, there are very few years at the beginning of the year and the end of each half of the eclipse season, another complete eclipse season in the middle of the year, Coincidentally, there are 5 new days in the eclipse season in this year (the mid-year eclipse season contains two new days, and the two and a half eclipse seasons at the beginning and end of the year contain three new days), so there are 5 solar eclipses on the earth this year, such as 1935, there are 5 solar eclipses in the world in a year, this is the case, of course, these 5 are partial eclipses.

There are still opportunities to observe total solar eclipses on the land of our country, for example, last year, the best observation area was in Gansu, There will be a total solar eclipse belt through China, but these times do not coincide with this total eclipse belt, if you don't mind running around the country, you can chase the next total solar eclipse after 25 years, if you go abroad and come and go freely, you don't have to wait so long to see the total solar eclipse abroad, but if your freedom of movement will be constrained in all kinds, then cherish this time, Total solar eclipses will not visit the Yangtze River basin again in a hundred years, not to mention that there are few total solar eclipses that can last more than 5 minutes and 30 seconds like this year.

Is there a certain cycle to a total solar eclipse?

The exact period is very long, the approximate period is 19 years, known as the "Saro cycle".

For example, there will be a total solar eclipse on July 22 this year, and another solar eclipse will occur 19 years later, on July 22, 2028. But it is not necessarily a total solar eclipse, and it may not be seen in the Yangtze River basin in China.

No, sometimes the interval is very close, sometimes it is far away, and in a few days it will be a total solar eclipse, and after this time, you will have to wait another 300 years.

Solar and lunar eclipses are collectively referred to as copative eclipses. From the principle of solar and lunar eclipses, it can be seen that the occurrence of eclipses is closely related to the conjunctive movement of the sun, the earth and the moon, and this conjunctive movement is periodic, so the solar and lunar eclipses should naturally also be periodic. The cycle of intercourse was discovered by the ancient Babylonians and is called the "saro cycle" ("saro" means repeatedness), which is a little more than 18 years and 11 days.

i.e. 6585 for 32 days.

The process of a total solar eclipse can be divided into the following five periods: the first loss, the eclipse, the eclipse, the light, and the recuperation.

First loss. Since the Moon orbits the Earth from west to east, the eclipse always begins at the western edge of the Sun's circle. When the eastern edge of the moon first touches the circular surface of the sun (that is, the moment when the eastern edge of the lunar surface and the western edge of the lunar surface are tangent), it is called the first wancing.

The first waning is the moment when the eclipse process begins.

Eat both. From the beginning of the loss, it is the partial eclipse stage. As the moon continues to move eastward, the part of the sun's circle that is obscured by the moon gradually increases, and the intensity and heat of sunlight decrease significantly.

When the eastern edge of the lunar surface is intangent to the eastern edge of the solar surface, it is called an eclipse. At this time, the entire circle of the sun is obscured, so the eclipse is the moment when the total solar eclipse begins.

Eat very much. After the eclipse, the lunar wheel continues to move eastward, and when the center of the lunar wheel and the center of the sun are closest to each other, the eclipse is reached.

Shine. For partial solar eclipses, an eclipse is the time when the Sun is most obscured by the Moon. The moon continues to move eastward, and the moment when the western edge of the lunar surface and the western edge of the solar surface are intangent is called shengguang, which is the moment when the total solar eclipse ends.

Round. After the light is generated, the lunar surface continues to move away from the solar surface, and the obscured part of the sun gradually decreases, and the moment when the western edge of the lunar surface tangent to the eastern edge of the solar surface is called a double circle. At this time, the sun takes on the shape of a disk again, and the entire total solar eclipse process is over.

The change process of total solar eclipse can be divided into the following five periods: initial loss, eclipse, eclipse, light, and reunion.

First eclipse: Since the Moon orbits the Earth from west to east, the eclipse always begins at the western edge of the Sun's circle. When the eastern edge of the moon just touches the circular surface of the sun, it is called the first eclipse. The first waning is the moment when the eclipse process begins.

Eclipse: From the beginning of the loss, the British astronomer Berry was the first to describe this phenomenon, so it is also called Pellet. This is due to the fact that there are many rugged peaks on the surface of the moon, and when the sun shines on the edge of the moon, the Bailey bead phenomenon is formed.

Eclipse: After the eclipse, the sun wheel continues to move eastward, and when the center of the moon wheel and the center of the sun are closest to each other, it will be the eclipse. An eclipse is the time when the sun is most obscured by the moon.

Generating light: The moon continues to move eastward, and the moment when the western edge of the lunar surface and the western edge of the solar surface are intangent is called shengguang, which is the moment when the sun returns to the lead eclipse.

Roundness: After the light is generated, the moon surface continues to move away from the sun surface, and the part of the sun that is obscured gradually decreases, when the western edge of the moon surface tangent to the eastern edge of the sun surface, it is called a double circle. At this time, the sun takes on the shape of a disk again, and the total solar eclipse process of the whole world is over.

On average, a total solar eclipse occurs once a year around the world. For the same location, total solar eclipses generally occur with a frequency of about 300 years. As for total lunar eclipses, according to statistics within the "Saro Cycle", there are about 28 lunar eclipses (about 43 solar eclipses) in a cycle of about 6,585 days (a little more than 18 years), of which 12 to 13 are total lunar eclipses.

To put it simply, a total lunar eclipse occurs about once every year and a half.

It should be noted that each lunar eclipse occurs when it is only visible to people halfway around the world (night hemisphere), so it takes an average of three years to see a total lunar eclipse in the same area.

In terms of the number of occurrences around the world, there are actually more solar eclipses than lunar eclipses in a year. From Earth, the orbits of the Sun and Moon "intersect" every six months, and the period of time when a solar eclipse may occur (eclipse season) is longer than the period of time when a lunar eclipse occurs (lunar eclipse season).