What causes solar eclipses? Detailed answer

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What causes solar eclipses? Detailed answer

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What causes solar eclipses?

Three cosmic bodies take part in the eclipse of the Sun: the Moon, the Earth and the Sun. As you know, the moon revolves around the Earth, and that, in turn, continuously orbits around the Sun. Thus, from time to time there comes a moment when the Moon is directly between the Earth and the Sun illuminating it. In this case, a phenomenon called a solar eclipse occurs.

An eclipse of the Sun can only occur during a new moon, since that is when the Moon is on the side of the Earth that faces the Sun. If the Moon's orbit were in the same plane as the Earth's, then an eclipse would occur at every new moon.

However, on its 29,5-day journey around the Earth, the Moon usually passes away from the straight line connecting the Earth and the Sun. Astronomers can predict, to fractions of a second, the onset of a solar eclipse and its duration. They can also tell in advance whether a given eclipse will be total, annular, or partial.

If the Moon completely covers the Sun, then such an eclipse is called total. However, the distance from the Earth to the Moon is not constant and is often too great for a solar eclipse to occur. Then one can observe a picture when the dark disk of the Moon covers the entire Sun, with the exception of a thin ring around its circumference. This means that an annular eclipse is taking place. A partial eclipse is any eclipse in which the moon only partially covers the solar disk.

Every year there are at least two solar eclipses, but their number can reach up to five. In any given place on the globe, a total solar eclipse can be seen only once in about 250-300 years. Therefore, astronomers have to "chase" total eclipses around the world.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Why was the pager invented?

When about half a century ago, the American radio engineer Al Gross invented the pager, he intended this device to urgently call hospital doctors to patients.

But it turned out that the doctors did not want to be called to intensive care at any time. One doctor bluntly said to the inventor: "There is a golf course next to the hospital, do you really think that I would like to be constantly torn off the club?"

In 2001, there were approximately 300 million pagers in operation worldwide.

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Bicycle wheel purifies the air 16.10.2020

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“While cycling around London, I can see and feel pollution from tires and exhaust pipes,” Tapping told Designboom. “I thought, why not use a vehicle to filter the air? If it turns out that the product has a future, I will try to bring it to a commercial level.”

ROLLOE can be mounted in front of a standard bike frame. The wheel has three levels of filters. The first is a sponge made of eco-friendly material based on loofah, which traps large particles. The second is a HEPA air filter and the third is an activated carbon filter that absorbs the smallest particles.

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