A solar eclipse occurs up to 5 times a year. If it occurs 5 times, it must be a partial eclipse. There are at least two solar eclipses on the earth every year. Only partial solar eclipses can be seen in the Arctic and Antarctic regions. A total solar eclipse occurs approximately once a year and a half. Every solar eclipse starts at a certain point at sunrise and then ends at every hour of the day along the eclipse belt. From the start point to the endpoint about half a circle around the earth.
How many times in a year？
- One eclipse season is 36 days
An eclipse season of a solar eclipse is 36 days, which is longer than the average length of a synodic month of 29.53. Therefore, one solar eclipse must occur during the eclipse season of a solar eclipse, and two solar eclipses may also occur. There are two solar eclipse seasons in a year, so there will be at least two solar eclipses in a year, and there may be four solar eclipses (if each eclipse season contains two new days).
- A lunar eclipse has 24 days in one eclipse seaso
The eclipse season of a lunar eclipse is 24 days, which is shorter than the average large number of 29.53 days in a synodic month. Therefore, an eclipse of the lunar eclipse may include a full moon or not. That is to say, there may be a lunar eclipse during this eclipse season, or even a lunar eclipse may not occur. There are also two lunar eclipse seasons in a year;” So in a year, there may be two lunar eclipses, or even one lunar eclipse may not occur.
- Four solar eclipses and two lunar eclipses a year
In a year, the maximum number of solar and lunar eclipses can reach six times, that is, four solar eclipses and two lunar eclipses. But in fact, sometimes there are as many as seven solar and lunar eclipses in a year, that is, five solar eclipses and two lunar eclipses, or four solar eclipses and three lunar eclipses. For example, there were five solar eclipses and two lunar eclipses in 1935, and it will be the same in the future 2160; there were four solar eclipses and three lunar eclipses in 1917 and 1982. So, why are there as many as seven solar and lunar eclipses in a year?
Mainly the gravitational action of the sun
This is because, under the gravitational force of the sun, the intersection of the ecliptic and the white road will continue to move along the ecliptic from east to west, moving about 20 degrees per year. This direction is opposite to the direction the sun moves along the ecliptic, so the sun is continuous on the ecliptic The time interval (this interval is called an “eclipse year”) for passing through the same node twice is shorter than one year (365.2422 days), only 346.62 days, 19 days less. This will produce two situations: one situation is 365.2422 days a year, including two complete food seasons and one incomplete food season. For example, the first eclipse season starts in early January, then after an eclipse year of 346.62 days, the third eclipse season will begin in mid-December of the same year. In this case, five solar eclipses and two eclipses may occur. The second lunar eclipse; another situation is 365.2422 days in a year, including two incomplete food seasons (one at the beginning of the year and one at the end of the year) and a complete food season. In this case, it may happen Four solar eclipses and three lunar eclipses.