Why does the first quarter moon appear in the western sky in the evening and the first half of the n

For the bright side of the moon must be toward the sun, and at the first quarter the moon is on the east side of the sun, so the bright side is of course to the west; The moon is on the west side of the sun, and the bright side is naturally east.

Up up, up up West West, down down East East" This is the phase of the moon.

The shorthand mantra, "Shang Shang Shang Xixi" means: the first quarter moon.

Appears in the first half of the first half of the lunar month, with the moon facing west, in the western half of the sky (the concave side faces east).

"Xiaxiaxiaxiadongdong" means that the last quarter moon appears in the second half of the second half of the lunar month, with the moon facing east (the concave side facing west) and is located in the eastern half of the sky.

First Quarter Moon: The Moon continues to rotate forward until the beginning of the lunar calendar.

On the seventh and eighth days, the sun sets, and the moon is already overhead, and in the middle of the night, the moon sets, and at this time, the moon illuminated by the sun is exactly half of it for you to see, which is called the "first quarter moon".

The second quarter of the moon: after the full moon, the moon rises later and later, and the bright part of the moon is smaller than what Yushi saw in one day, and it is the twenty-third day of the Qingzhaosan lunar calendar. Half of the full moon is lost, and the half moon only appears in the eastern half of the sky in the second half of the night, which is the "last string".

Because the moon is at 90° east of the sun on the first quarter of the moon. So when the sun sets, the moon is right overhead, and then slowly moves westward. By 0:00 in the middle of the night it fell in the west.

So we can see the moon all in the western sky. It is not visible during the day (afternoon) in the eastern sky.

The first quarter moon is the state in which the moon comes out of the west in the first half of the night and the moon faces west. The various shapes of the moon are called moon phases. There are two main reasons why the phases of the moon occur:

One is that the moon itself does not emit light, but reflects the sun's light. Second, while the moon revolves around the earth, it also orbits with the earth, and the relative positions of the sun, the earth, and the moon are constantly changing. As a result, the shape of the bright part of the moon as seen on Earth is constantly changing, resulting in different phases of the moon.

First quarter moon (around the eighth day of the lunar calendar): 90 degrees;

Gibbous Moon (around the 9th lunar month --- 14th lunar month): 90 degrees--- 180 degrees;

Full moon (looking at the moon, around the night of the 15th or 16th day of the lunar calendar): 180 degrees;

Gibbous Moon (around the 16th lunar --- 23rd lunar calendar): 180 degrees --- 270 degrees.

1. At the first quarter of the moon, we will see the moon rising in the west in the evening, but that is not the place where the moon rises, because the moon still rises in the east, but when it rises, it is still daytime, and the moon cannot be seen, and in the evening, the moon is almost set, so it is in the west.

2. The Moon is a spherical celestial body revolving around the Earth, and it is also the only natural satellite of the Earth. In Chinese, it is commonly known as the moon or moon, and in ancient times, it was also called Taiyin, Xuantu, Chanjuan, and Yupan. The Moon is the fifth-largest moon in the solar system, with an average radius of about kilometers, which is equivalent to times the radius of the Earth; The mass is close to kilograms, which is twice that of the Earth.

The surface of the Moon is covered with craters formed by the impact of small celestial bodies. The average distance between the Moon and the Earth is about 10,000 kilometers, which is about 30 times the diameter of the Earth. On May 16, 2019, the National Astronomical Observatories of the Chinese Academy of Sciences announced that a research team led by Li Chunlai, a researcher at the Chinese Academy of Sciences, used the Chang'e-4 probe data to prove the existence of deep materials dominated by olivine and low-calcium pyroxene in the South Pole-Aitken Basin on the far side of the Moon.

The international academic journal Nature published this significant discovery. At noon on October 26, 2020 local time, NASA's Stratospheric Infrared Astronomical Observatory Sophia confirmed for the first time that there was water on the sunny surface of the Moon.

The first quarter moon is the state in which the moon comes out in the first half of the night and comes out in the west, with the moon facing west. The various shapes of the moon are called moon phases. There are two main reasons for the moon phase: one is that the moon itself does not emit light, but reflects the sun's light.

First quarter moon (around the eighth day of the lunar calendar): 90 degrees;

The last quarter moon means that the sun, the earth, and the moon are in a certain position. In the lunar calendar every month.

Two. Ten. On the 2nd and 23rd, because you can only see the semicircle to the east of the moon, it is called "the second quarter". The average time it takes for the moon to move from the new moon position to the new moon position again is days, that is, the average period of change in the phases of the moon is days, which is called a "synodic month".

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The moon, commonly known as the moon, was also known as Taiyin, Xuantu, Chanjuan, and Yupan in ancient times, and is the satellite of the earth and the fifth largest satellite in the solar system. The Moon is about a quarter of the diameter of the Earth and about one-eighty-one times the mass of the Earth. The Moon is the most massive moon, and its surface is covered with craters formed by the impact of small celestial bodies.

The average distance between the Moon and the Earth is about 380,000 kilometers, which is about 30 times the diameter of the Earth.

The front side of the moon is dotted with huge impact craters filled with basalt lava flows ejected from dark volcanoes, forming a vast plain called the "Moon Sea", in fact, there is not a drop of water in the "Moon Sea". Between the outer and lunar seas are bright, ancient plagioclase highlands and conspicuous impact craters. It is the brightest object in the sky other than the Sun, and although it appears a very bright white, its surface is actually very dark and the reflectivity is only slightly higher than that of old asphalt.

Because the moon is very conspicuous in the sky, coupled with the regular changes in the phases of the moon, it has had a significant impact on human culture such as myths and legends, religious beliefs, philosophical thoughts, calendar compilation, literature and art, and customs and traditions since ancient times.

First quarter moon. The first quarter moon comes out in the middle of the night and comes out in the west, with the moon facing west.

On the first day of the lunar month, when the moon moves between the sun and the earth, the moon faces the earth with its dark side, and rises and falls with the sun, so people cannot see it. The phase of the moon at this time is called the "new moon" or "new moon".

After the new moon, the moon gradually moves out of the area between the earth and the sun, and then we begin to see a small part of the moon illuminated by the sun, which is shaped like a curved eyebrow, so the moon phase at this time is called "the moon of the eyebrow".This "crescent moon" can only be seen in the western sky in the evening.

Around the eighth day of the lunar calendar, the moon has moved to a 90° angle east of the sun as seen from the earth. At this time, we can see the bright half of the moon to the west, and the moon phase at this time is called "winding".The first quarter moon can only be seen in the first half of the night, and it submerges into the west in the middle of the night.

After the winding, the moon becomes fuller day by day, and we can see most of the bright hemisphere of the moon, and the phase of the moon at this time is called "gibbous moon".

It's time for the lunar calendar. Ten.

At 5 and 16 o'clock, the moon runs on the celestial sphere to the opposite side of the sun, the sun and the moon are 180 ° apart, that is, the earth is located between the sun and the moon, from the earth, the whole light of the moon is facing the earth, and the moon phase at this time is called "looking at the moon" or "full moon".At dusk, the full moon rises in the east.

and at dawn it sinks to the west.

After the full moon, the moon becomes "thin" as the sun and moon positions get closer. It goes through the gibbous moon, the last quarter and the crescent moon in turn, and finally, it returns to the position of the new moon. In China, it is customary to call the "Moon" in the second half of the month "the waning moon".

The first and second quarters, the waxing crescent and waning moons are similar in appearance, but they appear at different times, in different positions, and in the direction of their bright surfaces. The crescent moon and the first quarter moon appear in the western sky in the evening and the first half of the night, respectively, and their "faces" are facing west, that is, the western half is bright; The waning moon and the waning moon appear in the eastern sky at dawn and the second half of the night, respectively, and their "faces" are facing east, i.e., the eastern half is bright. Since the date of the lunar calendar in China is arranged according to the phases of the moon, the working people of ancient China sometimes relied on it to judge the date of the lunar calendar and the approximate time of the night.

The average time it takes for the moon to return to the crescent position is days, that is, the average cycle of the phases of the moon is days, which is called a "synodic month".

The second quarter moon rises in the east at 12:00 p.m. and sets in the west at 12:00 p.m.

The first quarter moon appears in the first half of the night of the first half of the moon, in the western half of the sky, and the western half is bright. The last quarter moon appears in the second half of the night in the second half of the month, in the eastern half of the sky, and the eastern half is bright. The first quarter moon generally occurs on the seventh and eighth days of the lunar month, and the second quarter moon is the twenty-second and twenty-third of the lunar calendar.

The crescent moon and the first quarter moon appear in the western sky in the evening and the first half of the night, respectively, and their "faces" are cherry blossoms facing west, that is, the western half is bright; The waning moon and the waning moon appear in the eastern sky at dawn and the second half of the night, respectively, and their "faces" are facing east, i.e., the eastern half is bright.