A total lunar eclipse occurs once every few years, and a total lunar eclipse occurs only once every

Of course, there is a law, which is related to the revolution and rotation of the earth.

The whole process of a total solar eclipse.

Since the Moon orbits the Earth from west to east, a solar eclipse always begins at the western edge of the Sun's circle. When the eastern edge of the lunar surface is tangent to the western edge of the solar surface, it is called the first waning. The first waning is the moment when the eclipse process begins.

From the beginning of the first waning, the moon continues to move eastward, and 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 point, the entire circle of the sun is obscured.

After eating, the moon will be tired, the paralyzed couple will be tired, the twilight legs, the legs, the mother, the south, the sorrel, the sorrel, the 6 even palms, the heart of this burden, into the sorrel, the sorrel, the clumsy otter?

After the eclipse, 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.

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

How to observe a solar eclipse.

The easiest way to do this is to find a piece of glass, apply some ink or blacken it with smoke, and use them to eclipse the sun, so that your eyes will be protected from harm.

Telescopic observation Do not look at the sun directly through the telescope, otherwise it will burn your eyes. A more appropriate approach is to use a projection panel. The projection pole is installed at one end of the eyepiece, and the focal length of the eyepiece is adjusted so that a clear image of the sun appears on the projection board to observe the whole process of the solar eclipse.

There is no pattern! It can only be seen when all the conditions are met. In the annual lunar calendar.

Ten. 5. 16. The moon moves in the opposite direction to the sun. At this time, if the center of the Earth and the Moon are roughly in the same straight line, the Moon will enter the Earth's umbra and produce a total lunar eclipse. If only part of the Moon enters the Earth's umbra, a partial lunar eclipse occurs.

When the Moon enters the penumbra of the Earth, it should be a penumbral eclipse, but because its brightness is weakened very little and it is not easy to detect, it is not called a lunar eclipse, so there are only two kinds of lunar eclipses: total lunar eclipses and partial lunar eclipses. Lunar eclipses occur in the hope (full moon), but not every lunar eclipse occurs, which is the same as not every solar eclipse.

Every 14 months. Lunar eclipses generally occur on the 15th or 16th day of the summer calendar. Globally, total solar eclipses are a common astronomical phenomenon that occurs twice every 3 years.

Globally, not every lunar eclipse occurs, and not every lunar eclipse is a total lunar eclipse, according to the 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.

The process of a total lunar eclipse is divided into five stages: initial loss, eclipse, eclipse, rebirth, and recirclement.

First Loss: The Moon has just touched the Earth's umbra, marking the beginning of a lunar eclipse.

Eclipse: The western edge of the Moon is inscribed with the western edge of the Earth's umbra, and the Moon just enters the Earth's umbra.

Eclipse: The center of the Moon is closest to the center of the Earth's umbra.

Light: The eastern edge of the Moon is intangent to the eastern edge of the Earth's umbra, at which point the total eclipse phase ends.

Roundness: The western edge of the Moon is tangent to the eastern edge of the Earth's umbra, at which point the entire lunar eclipse ends.

1. The time of a total lunar eclipse is not fixed, generally once every 1-2 years, but a series of April eclipses is very rare. A "chain of April eclipses" refers to four consecutive total lunar eclipses with six full moons apart, and there have only been three in 500 years, the fourth of which will occur on April 15 and October 8 this year, and the remaining two total lunar eclipses will occur on April 4, 2015 and September 28, 2015.

2. The best observation points for these 4 consecutive total lunar eclipses are all in North America, and the total lunar eclipse on April 15 this year could not be observed in China. According to NASA's projections, the fifth series of April eclipses will occur in 2032 and 2033. A rare series of April eclipses, and if you miss this one, you will have to wait another 18 years.

The probability of seeing a total solar eclipse in a fixed area of the earth is about once every 300 years, while the probability of seeing a total lunar eclipse in the same area is about once every 3 years.

Adjacent solar and lunar eclipses are always about half a month apart, the solar eclipse must occur on the first day of the lunar calendar, and the lunar eclipse must occur at the time of the full moon. So the interval is about half a month of the lunar calendar.

The key to the occurrence of a total solar eclipse is the Earth-Moon distance. If the Moon is at perigee but its apparent diameter is smaller than the Sun's apparent diameter, then the Moon is not enough to completely obscure the Sun. At that time, there will be no more total solar eclipses on Earth, only annular solar eclipses.

The last total lunar eclipse occurred in January 2019.

A total lunar eclipse is the perfect "feast" for the moon to be dedicated to the earth, and when the eclipse begins, the bright moon darkens as it enters the outer part of the Earth's shadow, the semi-dark zone. When the Moon enters the deepest part of the Earth's shadow (or umbra), the depth of the total lunar eclipse is visible. Scientists explain that the colors displayed by the lunar eclipse are the colors of all sunrises and sunsets on Earth that reach the Moon.

Total lunar eclipse

The astronomical term is a kind of lunar eclipse, when the moon, the earth, and the sun are completely in a straight line, the earth is in the middle, and the entire moon enters the shadow of the earth, and the surface of the moon turns dark red, forming a total lunar eclipse.

For example, on October 8, 2014, a "total lunar eclipse" was staged in the sky, and the moon did not disappear, but became a mysterious and beautiful "red moon". The total lunar eclipse began at 17:14 on the evening of the 8th, and lasted about 3 hours and 20 minutes from the initial waning to the reunion. On the night of April 4, 2015, there was a total lunar eclipse in the sky.

The time of the initial loss was 18:15 on the 4th; The time of the meal is 19:54; The time of eclipse is 20:00; The time of light is 20:06; The time of the reunion is 21:45.