How does the earth move? Detailed answer

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How does the earth move? Detailed answer

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How does the earth move?

The earth, as you know, performs two types of motion. It rotates around its own axis, as well as in orbit around the Sun. The first movement of the Earth, which was discovered by man, was the movement around its axis. This movement causes a picture of the rising and setting of the sun, the moon and stars, the change of day and night. The time for a 360-degree turn (the complete rotation of the Earth on its axis) is 23 hours, 56 minutes, 4,091 seconds.

It was believed that the speed of the Earth's rotation never changed or was constant, at least for millennia. However, very small deviations were still observed. Due to the friction generated by the sea tides and changes in the earth's crust, our day is getting longer by 1/1000 of a second per century. Scientists monitor these subtle changes and measure them. The earth also moves around the sun.

At some points in its orbit, it is closer to the Sun than to other planets. When it is closest to the Sun, this position is called "perigee", and when the Earth is furthest away from the Sun, this is called "apogee". The Earth, like other planets, moves in a certain orbit at a speed that depends on the distance of the planet from the Sun. A planet moves faster the closer it is to the sun.

Thus, it moves fastest at perigee and slowest at apogee. Since the distance from the Earth to the Sun is always different, the orbital speed is constantly changing. At perigee, the Earth moves in orbit at a speed of 30,2 km/s. And at apogee, its speed is 29,2 km / s.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

What year in Europe was characterized by the absence of summer?

In 1816, unusually cold weather reigned in Europe and North America, and it went down in history as "the year without summer." The reason was the eruption a year earlier of the Tambora volcano on the other side of the globe - the Indonesian island of Sumbawa. That same summer, the writer Mary Shelley was vacationing with friends in a villa. Due to bad weather, they often stayed at home and arranged a competition to write creepy stories - this is how Shelley's famous novel "Frankenstein, or the Modern Prometheus" was born.

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