Why do lunar eclipses occur and why do they occur

The principle of a lunar eclipse. in the 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. In general, the Moon either passes above or below the Earth's umbra, rarely passing through or partially passing through the Earth's umbra, so a lunar eclipse generally does not occur. Lunar eclipses occur up to 3 times a year, and sometimes none at all.

A lunar eclipse is a special astronomical phenomenon in which when the Moon moves to the shadow part of the Earth, the area between the Moon and the Earth will be obscured by the Earth's rays, and a piece of the Moon will be missing. That is, the Sun, Earth, and Moon at this time happen to be (or almost) in the same straight line, so the light from the Sun to the Moon will be obscured by the Earth.

When the Earth, the Sun, and the Moon are in a straight line, the Earth's shadow is cast onto the surface of the Moon, thus forming a lunar eclipse. Because the Moon is smaller than the Earth, the probability of a lunar eclipse occurring is greater than that of a solar eclipse.

If you can't see the moon, it's called a lunar eclipse, and even if the earth is the light, here's an image, just look at it.

The earth blocks the light from the sun shining on the moon, and the moon does not shine without reflection, and a lunar eclipse occurs.

A lunar eclipse occurs when the Sun, Earth, and Moon are in a straight line.

The earth has blocked the light of the sun, and the moon cannot be found!

That is, the moon is in the shadow of the earth!

A lunar eclipse occurs when the Sun, Earth, and Moon are in a straight line.

The moon turns into the shadow of the earth.

Why do lunar eclipses occur? As follows:

1. The formation of a lunar eclipse From a physical point of view, the principle is that light propagates in a straight line in the same uniform medium, the sun, the earth, and the moon form a straight line positional relationship, and the moon enters the earth's umbra, which becomes the lunar eclipse we usually see.

2. The time of occurrence depends on how far the moon is from the earth, which determines how much of the earth's shadow can cover, and how long the moon travels in this shadow.

3. The process of total lunar eclipse is divided into five stages: initial loss, eclipse, eclipse, light, and recirclement. The degree to which the Moon is eclipsed is called "eclipse", which is equal to the ratio of the farthest distance between the edge of the lunar ring and the Earth's umbra at the time of the eclipse to the Moon's visual meridian.

4. When the Moon is in the umbra zone of the Earth, although the sun's rays cannot directly reach its surface and make it reflect, the Earth's atmosphere absorbs the blue, violet, yellow and other light with shorter wavelengths when receiving the sun's rays, and refracts the red light that receives less influence from atmospheric scattering to the Moon in the Earth's shadow, so that we can see the moon showing a round of red.

A lunar eclipse is a special astronomical phenomenon in which when the Moon moves to the shadow part of the Earth, the area between the Moon and the Earth will be obscured by the Earth's rays, and a piece of the Moon will be missing. The Sun, Earth, and Moon at this time happen to be (or almost) in the same straight line. Lunar eclipses can be divided into three types: partial lunar eclipses, total lunar eclipses, and penumbral lunar eclipses.

Lunar eclipses can only occur around the 15th day of the lunar calendar.

Studies have found that when the gravitational pull of the earth and the moon is at its strongest, it often causes people's emotional instability, and they are easily excited, quarrelsome, and fond of fighting. Seizures in mentally ill patients have increased significantly, and some people have caused insomnia, dreaminess, chest tightness, dizziness, and headaches.

The incidence of coronary heart disease and myocardial infarction has its own rules, and the death distribution curve of myocardial infarction is just similar to the curve of the gravitational force of the earth and the moon, so it has been pointed out that the blood flow of the myocardium can be affected when the gravitational force of the earth and the moon is at its maximum.

And on the day of the lunar eclipse, the incidence of dizziness, headache, chest tightness, insomnia, and dreaminess will increase significantly, and even increase the incidence to 49%.

For the diseased body that has lost the balance of self-control and regulation in the body, when the gravitational attraction of the earth and the moon increases, the self-control and regulation function in the body that has been out of balance is even more unbalanced. Therefore, the biological effects of cardiovascular patients on the day of the lunar eclipse are more intense, and there is a tendency to aggravate the seizures.

The principle is that light travels in a straight line in the same homogeneous medium, and when the light is blocked by an opaque object on the backlit side, a shadow area is formed.

When the Moon moves to the shadow part of the Earth, the area between the Moon and the Earth will be obscured by the Earth's rays, and a piece of the Moon will be missing.

The Sun, Earth, and Moon at this time happen to be (or almost) in the same straight line. Lunar eclipses can be divided into three types: partial lunar eclipses, total lunar eclipses, and penumbral lunar eclipses. Lunar eclipses can only occur around the 15th day of the lunar calendar.

In ancient times, people did not understand the scientific reason for the occurrence of lunar eclipses, and they were afraid of lunar eclipses as much as they were afraid of solar eclipses. According to foreign legends, at the beginning of the 16th century, Columbus sailed to Jamaica in South America and clashed with the local natives.

Columbus and his sailors were trapped in a corner, without food and water, and in critical condition. Columbus, who knew a little about astronomy, knew that a total lunar eclipse was going to happen that night, so he shouted to the natives, "If you don't bring any more food, I won't give you moonlight!" ”。

In the evening, Columbus's words were fulfilled, and there was no moonlight. Seeing this, the natives were terrified and hurried to fight with Columbus.

What is the difference between a solar and lunar eclipse? What are the three celestial bodies involved in a solar and lunar eclipse? Which is the most common, solar or lunar eclipse? So, have you ever seen a lunar or solar eclipse? What's the difference between the two? Let's take a closer look at these two impressive celestial phenomena.

Because when the three planets of the sun, the earth, and the moon are in a straight line, the sun's light is partially blocked by the earth, or all of them, and there will be a lunar eclipse that we often see.

There are only two types of lunar eclipses: total lunar eclipses and partial lunar eclipses.

Causes of lunar eclipses: When the Moon orbits to the shadow of the Earth, the area between the Moon and the Earth will be obscured by the Earth's rays, and a piece of the Moon will be missing. The Sun, Earth, and Moon at this time happen to be (or almost) in the same straight line.

This astronomical phenomenon is called a lunar eclipse.

A lunar eclipse is a natural phenomenon in which when the Sun, Earth, and Moon are exactly or almost in the same straight line (the Earth is between the Sun and the Moon), the light from the Sun to the Moon will be partially or completely obscured by the Earth, resulting in a lunar eclipse. During a lunar eclipse, the direction of the Sun and the Moon is 180° different from each other for the Earth, so the lunar eclipse must have occurred around the 15th day of the lunar calendar. It is important to note that since the orbits of the Sun and Moon in the sky (called the ecliptic and white paths, respectively) are not in the same plane, but are about 5° angles, only if the Sun and Moon are near the two intersections of the ecliptic and the white path, respectively, will have a chance to form a straight line and produce a lunar eclipse.

There are three types of lunar eclipses: partial lunar eclipses, total lunar eclipses, and penumbral lunar eclipses. A partial lunar eclipse occurs when the Moon enters only part of the Earth's umbra; And when the entire Moon enters the Earth's umbra, a total lunar eclipse occurs. As for the penumbral lunar eclipse, it means that the moon only passes over the penumbra of the earth, causing a very slight decrease in the brightness of the lunar surface, which is difficult to see with the naked eye, so it is not noticed.

When a lunar eclipse occurs, if the observer in the shadow of the Earth does not see the Moon at all, a total lunar eclipse has occurred.