How many years does a total solar eclipse occur? Please, thank you

A Saro cycle is 6585 + 1 3 days (equivalent to 18 years or 18 years if there are 5 leap years)), which is the periodicity of the ancient Babylonians' observations of solar eclipses. 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. How many lunar eclipses can occur in a year?

For the whole Earth, there are a maximum of 3 times a year, sometimes none, and a solar eclipse that can occur up to 5 times a year, and at least 2 times. In this way, there are more solar eclipses than lunar eclipses every year, but why do people always see more lunar eclipses than solar eclipses? This is due to the small extent of the eclipse zone, which is only visible locally on Earth; For a given location, a partial solar eclipse can only be seen once every 3 years or so, and only once every 300 years.

Once a lunar eclipse occurs, people on half the world at night can see it, and on average, the chance of seeing a lunar eclipse is half as many as the number of lunar eclipses occurring in a certain area, so people have more chances of seeing a lunar eclipse than a solar eclipse. Since the Earth's orbital motion around the Sun and the Moon around the Earth has certain regularities, the occurrence of solar and lunar eclipses also has their cyclical periodicity. The ancient Babylonians calculated the least common multiple of the synodic month [length day] and the node month [length day] through the accumulation of a large number of observations.

By calculation, the timing of both 242 node months and 223 synodic months is; 223 days, less than 50 minutes apart. That is, every 18 years and zero days (if there are five leap months in those 18 years, it is 18 years and zero days), during this time, the relative positions of the Sun, the Moon and the Yellow and White nodes are constantly changing, and after this length of time, the Sun, Moon and Yellow and White Nodes return to their original relative positions, so there will be a solar and lunar eclipse similar to the previous one. This length of time is what we often hear about as the "Saros cycle".

The word "saro" means "saro" in Latin, and there are an average of about 71 eclipses per sarro cycle, including 43 solar eclipses and 28 lunar eclipses. With the Saros cycle, we can predict lunar eclipses. For example, on July 11, 1991, a total lunar eclipse occurred, and the occultation zone passed through Latin America and the Pacific region.

Going forward 18 years and 11 days, there must have been a solar eclipse on June 30, 1973, which was found to be the result of a total eclipse that crossed the continent. If we push back the time of the Salo cycle, we can calculate that there will also be a solar eclipse on July 22, 2009, which is the total solar eclipse that will occur in the Yangtze River basin in China.

In one place, it happens once every 300 years, because the sun, moon, and earth need to be in the same straight line for a total solar eclipse, and the moon is so small that it can't block all the sunlight!

1. First of all, globally, total solar eclipses are a common astronomical phenomenon that occurs twice every 3 years. The total solar eclipse zone is no more than 300 kilometers wide on Earth and only a few dozen kilometers at its narrowest.

2. Based on the historically valid total solar eclipse records, for a city or a region, it can only be observed once every 370 years on average, so there is a saying that "once in 370 years".

3. However, the statement that "it appears once in 370 years" is not rigorous enough. Because a total solar eclipse will be affected by the orbit of the Sun and Moon, the rotation of the Earth, and other factors. It's not that a total solar eclipse happened somewhere today, and it will definitely reappear in the same place 370 years from now.

1. There are up to 5 solar eclipses per year, and if there are 5 times, then they must be partial eclipses. There are at least 2 solar eclipses per year on Earth. Only partial solar eclipses can be seen in the Arctic and Antarctic regions. A total solar eclipse occurs about once every 1 1/2 years.

2. An eclipse season of a solar eclipse is 36 days, which is longer than the average length of a synodic month. Therefore, there must be one eclipse during the eclipse season of an eclipse, and two eclipses may occur. There are two eclipse seasons in a year, so there are at least two eclipses in a year, and possibly four (if each eclipse season includes two new days).

First of all, not every solar eclipse can be seen when a total solar eclipse occurs, the diameter of the sun is about 400 times that of the moon, so only when the orbits of the sun and the moon "meet" and the distance between the sun and the earth reaches at least 400 times the distance between the sun and the moon can the moon completely block the sun's direct light on the earth, forming a total solar eclipse.

A sarro cycle is 6585 + 1 3 days (equivalent to 18 years or 18 years if there are 5 leap years)), which is the periodicity of the ancient Babylonians' observations of solar eclipses.

The 18-year, 11-day, 8-hour saro cycle is very useful for the recurrence of the same food. After each passing period, the relative positions of the Earth, the Sun, and the Moon will be basically the same as before, so that the solar and lunar eclipses of the previous week will reappear one after another. There are about 43 solar eclipses and 28 lunar eclipses in each sarro cycle.

Specifically, you can check the "Saros cycle", not here).

The conclusion is that there are actually more solar eclipses in a year than lunar eclipses in terms of the number of occurrences worldwide. 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).

There may not be a single lunar eclipse in a year, but there must be two to five solar eclipses, but once a lunar eclipse occurs, half of the world can be seen in the dark night, and the total lunar eclipse is tens of minutes or even hours long, and the observable range and duration are much greater than the total solar eclipse, so the probability of being seen in the same place is higher.

On average, there will be a total solar eclipse once a year around the world.

For the same location, total solar eclipses generally occur with a frequency of about 300 years.

Hope it helps!