Not every time a solar eclipse occurs, you can see a total solar eclipse. The diameter of the sun is about 400 times that of the moon. Therefore, 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 can the moon completely block the direct sunlight of the sun and form a total solar eclipse.
A Shaluo period is 6585+ 1/3 days (equivalent to 1 1.3 days or 18 10.3 days (if there are five leap years), which is the periodicity discovered by Babylonians after observing the solar eclipse.
18 1 1 8 hours per day is very useful for testing the reappearance of the same food. After this time interval, the relative positions of the earth, the sun and the moon will be basically the same as before, so the solar eclipse of the last cycle will reappear. There are about 43 eclipses and 28 eclipses in each Charlotte cycle. (For details, you can check Baidu's "Sharo Cycle", so I won't expand it here. )
The conclusion is that in terms of the number of global occurrences, there are actually more solar eclipses than lunar eclipses in a year. From the earth, the trajectories of the sun and the moon intersect once every six months, and the cycle of solar eclipse (eclipse season) may be longer than that of lunar eclipse (eclipse season). There may not be an eclipse in a year, but there will be two or five eclipses. However, once a solar eclipse occurs, half the earth can see it in the dark. The total solar eclipse lasts for tens of minutes or even hours, and the observable range and duration are much longer than those of the total solar eclipse, so it is easier to see in the same place.
The global total solar eclipse will also occur once every 1.5 years on average. For the same place, the frequency of total solar eclipse is generally around 300 years. As for the total lunar eclipse, according to the statistics in the "Xia Luo Cycle", there are about 28 eclipses (about 43 eclipses) in a period of about 6585 days (18 years), of which 12 to 13 are total lunar eclipses. Simply put, there will be a total lunar eclipse every year and a half.
It should be noted that only half the earth (night hemisphere) can see each eclipse, so it takes an average of three years to see the total lunar eclipse in the same area. Look at the table below, it will be clearer!
Visible lunar eclipses in China during 20 10-2020: 2010.12.21/0.26/14: 32-18.
Among them, the total lunar eclipse is 20 1 1 year 10-1day (initial loss10 day at 20: 46, eclipse at 22: 32, last contact1day). 201410 April 8: total lunar eclipse (initial loss 17: 14, eclipse 18: 54, last contact 20:34)20 15 4. Finally, contact 21:46) 20181October 3 1: total lunar eclipse (initial loss 19: 48, eclipse 2 1: 30, )
You can see it once every 2-3 years on average!
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