Advice 1: Why the moon shines at night

In the past the Moon was for the people not the space satellite of the Earth, a celestial goddess, she protected the whole night, romantic and poetic. In his poems and songs people turned to the moon as a Muse. But time passed and it became clear to man that the Moon is a space object, even managed to visit on its surface.
Why the moon shines at night
Since ancient times the Moon was for the people very mysterious. Why she comes to replace the Sun shines all around, but not evenly each day, and change throughout the month? The shadow appears after the Moon has passed the stage of a full moon, and every day the area of the moon decreases. In the end, you can see the very thin sickle, and then for a few months and he disappears. But not for long. The mysterious nature of moonlight found its explanation. The moon shines in the night, not as bright as the Sun during the day, but still making the objects distinguishable. She is not a star and does not emit light itself, but may reflect the foreign light. If one side of the Earth is illuminated in bright sunlight the other is in shadow, but the Moon reflects the light that falls on her, illuminating thereby the earth's surface. The moon revolves around the Earth, and that, in turn, turns around the Sun, therefore their relative position is changing daily. When the entire half of the moon lit by the Sun, visible from Earth – it's a full moon. If the Moon is directly between the Sun and Earth, it reflects nothing and it is not visible, it is a new moon. The moon has no atmosphere, which would help to keep her more or less constant temperature. When one half of it illuminated by the Sun for two weeks, then the surface is heated more than 100 degrees Celsius. Then comes a moonlit night, when some part of the moon, the light does not fall at all, then the temperature there falls to -200 degrees Celsius. The observer from Earth will seem that the Moon illuminates the Earth by night, but also the converse is true. When the moon misses the sun, the light reflected from Earth, just its lights. There is a famous expression: the dark side of the moon. It does not mean that one half of the satellite may not reflect the light. The reason is that the Moon also rotates on its axis so it always faces the Earth only on one side. People long wondered what is on the other side of the moon, but when space travel was developed, managed to photograph the image of the reverse side. Despite the fact that it seems that all the riddles of the moon, mankind decided, on a moonlit night people still possessed a special mood, forcing to forget about everything that is known about this space object science.

Advice 2: Why day the moon is visible

The phenomenon of visibility of the moon is actually observed on the new moon. This is due to some cause. Side of the moon that is illuminated by the Sun, every time refers to the inhabitants of the Earth from a new angle, with the result that there is the changing of the moon phases. This process is not affected by the Earth's shadow, except for those moments when the Moon is eclipsed during a full moon. This phenomenon occurs twice a year.
Why day the moon is visible



During the new moon, the moon and the Sun interact as follows: the moon aligned with the Sun, resulting in the consecrated part of the moon becomes invisible. At the end of the day it can be observed in the form of a narrow Crescent, which is gradually increasing. This period is usually called the growing Moon.

During the movement of the earth's satellite along its orbit in the first quarter of the moon cycle begins to develop the apparent distance of the moon from the Sun. A week after the onset of the new moon, the distance from the moon to the Sun becomes exactly the same as the distance from the Sun to the Earth. At this moment it becomes visible a quarter of the lunar disk. Further, the distance between the sun and the satellite continues to grow, which is called second quarter of the lunar cycle. At this moment the Moon is at the farthest point of orbit from the Sun. Her phase at this moment will be called a full moon.

In the third quarter of the lunar cycle, the satellite begins its reverse movement relative to the Sun, coming closer to him. The waning Moon again reduced to the size of a quarter disk. The lunar cycle is completed by the fact that the satellite returns to its original position between the Sun and Earth. At this point, the consecrated part of the moon entirely ceases to be visible to the inhabitants of the planet.

In the first part of its cycle the Moon occurs in the morning over the horizon, with the rising Sun is at the Zenith by noon and in the visible area throughout the day to the setting sun. This pattern is usually observed in tropical and subtropical zones.

Thus, each appearance of the lunar disk depends on the phase in which there is a heavenly body at one time or another. In this regard, there are such thing as growing or waning moon, and blue moon.


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