The difference between the upper and lower quarters and a lunar eclipse, is the upper and lower quar

The first quarter moon is the crescent moon at the beginning of the lunar month, hooked upwards, and in the west, it rises in the first half of the night. The second quarter moon is the crescent moon at the end of the lunar month, hooked downwards, in the east, rising in the second half of the night.

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.

The first quarter moon is divided into the first quarter moon and the second quarter moon, which is due to the continuous change of the position of the sun, earth and moon, and the moon phase changes in profit and loss.

The moon you usually see is either the first or the last quarter, and lunar eclipses are rare.

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.

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The second and second quarters of the moon are the phases of the moon The reason for the moon phase is the change in the position of the sun, the earth and the moon.

Since sunlight only illuminates half of the moon, it's the side facing the sun, just like there is a day and night on Earth.

When the Moon is between the Sun and the Earth, facing the Earth, the ground side is dark, and this is the New Moon.

At the time of the first and second quarters, the Sun, Earth, and Moon are at an angle of 90°, so we can see that half of the Moon is bright on Earth.

The full moon is when the earth is between the sun and the moon, and the side of the moon facing the earth is bright, so what we see is the full moon.

As for the lunar eclipse. The phenomenon of partial or total darkening of the lunar surface is called a lunar eclipse.

Due to the refraction of sunlight by the Earth's atmosphere, the Moon in the part where the eclipse occurs is not completely black, but faintly bronze.

Types of lunar eclipses: total lunar eclipse partial lunar eclipse.

Cause: The sun and the earth and the moon are in a straight line The earth blocks the sun's rays.

When the Earth moves between the Sun and the Moon, it obscures the sun's rays and forms a long shadow area on the backlit side of the Earth. When the Moon enters different locations in the Earth's shadow zone, observers on Earth will see a total or partial lunar eclipse. ）

Since there is an angle of 5° between the orbit of the Moon and the orbit of the Earth, lunar eclipses do not occur every month.

A lunar eclipse begins at the eastern edge of the lunar ring and ends at the western edge.

The cloudiness of the moon and the lunar eclipse are two different phenomena. So roll up and guess that the last quarter moon is not a partial lunar eclipse.

The waxing of the moon, i.e. the change of the phases of the moon during the month, is due to the following reasons:

The moon is spherical, so the sun must only illuminate half of the sphere when it shines on the ball, and when we look at the moon from the earth, the illuminated half of the sphere is not always completely visible (when it is fully seen, it is a full moon), and the bright hemisphere we look at from the side is the crescent moon in front of Qi.

In addition, the orbital plane of the moon around the earth and the orbital plane of the earth are not parallel, so it is not common for the sun, earth, and moon to be in a straight line, but this always happens after a period of time, and it is called a lunar eclipse when the earth just obscures the sunlight shining on the moon. The Earth's shadow in the moon's orbit is much larger than that of the moon, so most lunar eclipses are total eclipses, and partial lunar eclipses are situations in which the Earth's shadow sweeps the surface of the moon from the edge and never completely obscures it.

In short, the change in the phases of the moon is caused by the opacity of the moon, and the lunar eclipse is caused by the opacity of the earth.

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The main difference between a lunar eclipse and a moon phase is that the edges of the Earth's shadow are blurred in the lunar eclipse, while the moon phase is very clear.

The reason why the earth's shadows are blurred is because the edges of the shadows are like this. Standing in the sunlight, you look at your own shadow and you will also see that the edges of the head are blurred. And because the Moon has no atmosphere, the boundary between light and dark in the phases of the moon, that is, the morning and dusk lines on the moon, is extremely distinct.

In addition, the shape of the moon phase does not change noticeably overnight, while the shape of a lunar eclipse changes very quickly, and the difference can be seen in a few moments. Even if you have the same lunar eclipse, you will see different shadows when you stand in different geographical locations. For example, in eastern China, the moon has already sunk in the west at the beginning of the lunar eclipse, but for Europe, the moon has just risen at the same time.

Categories: Science & Engineering.

Analysis: The phases of the moon are changes in the size of the bright parts of the moon seen due to the different positions of the observers.

A lunar eclipse is a phenomenon in which the bright parts that would otherwise be visible are obscured due to the obscuration of the Earth's shadow. These are two completely different astronomical phenomena.

a) Let's talk about the phases of the moon first:

1.When the Moon is exactly between the Sun and the Earth (the first day of the lunar month), the part facing the Earth happens to be the dark side of the Moon, and the observer on the Earth cannot see the bright part of the Moon in any case, which is the New Moon. This darkness is what it "should" be.

2.When the moon turns to the extension of the earth and the sun (the fifteenth day of the lunar month), the earth is facing the entire bright side of the moon, and the observer on the earth can see the entire bright disk-like moon, which is the full moon.

3.Upper and lower quarter moons: When the angle between the Earth, the Sun and the Moon is 90 degrees, the hemisphere of the Moon facing the Sun is still bright, but only half of it is facing the Earth, and observers on Earth can only see the half-light and half-dark phases of the moon.

This is the Quarter Moon. Others such as waning moon, gibbous moon, etc. are similar.

2) Lunar eclipse: When the moon is full, the earth is exactly between the moon and the sun, and at this time, the shadow of the earth may fall right on the moon, so that the moon, which should be bright, loses its light, which is a lunar eclipse.

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The moon is seen by the name of the sun-illuminated part.

Different names mean different things and that's it.

Lunar eclipses occur in the second half of the month, and lunar eclipses occur at the time of the full moon, and the process of memorizing lunar eclipses is divided into five stages: initial loss, eclipse, eclipse, light, and recirclement.

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.

The course of the lunar eclipse:

The process of 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.

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.

A solar eclipse, also known as an eclipse, is the movement of the moon between the sun and the earth, if the three are exactly in a straight line, the moon will block the light of the sun to the earth, and the black shadow behind the moon will fall on the earth, and the solar eclipse phenomenon will occur.

When the moon moves between the sun and the earth, the moon blocks part or all of the sun's rays for parts of the earth, and it looks as if part or all of the sun has disappeared, hence the name. A solar eclipse only occurs when the Moon is in conjunction with the Sun. Solar eclipses are fairly rare phenomena, and the rarer of the three types of solar eclipses is a total solar eclipse.

This is because the eclipse can only be observed by people in the region when the moon's umbra is projected on the Earth's surface. A total solar eclipse is quite a magnificent natural sight.