How many times does the earth revolve?

We live on the earth, and the weather changes in spring, summer, autumn and winter every year are the result of the earth's revolution around the sun. Do you know how long and how far it takes for the earth to make a circle?

The revolution of the earth is a periodic circular motion, which follows the laws of the earth's orbit, the plane of the earth's orbit, the angle of intersection of the ecliptic and the equatorial plane, the period of revolution of the earth, the speed of the earth's revolution and the effect of the earth's revolution. We already know that the radius of the earth's orbit is 65.438+0.5 billion kilometers, so it is easy to calculate the circumference. According to the formula of pi s=2πr, it can be calculated that the revolution of the earth is about 940 million kilometers. The earth revolves around the sun along an ellipse with a small eccentricity at a speed of 29.79 kilometers per second. It takes 365 days, 5 hours, 48 minutes and 46 seconds to cover 940 million kilometers, which is about a year.

The English name Earth comes from Middle English, and its history can be traced back to Old English (usually called "eor_e"). There are cognates in Germanic language, whose original Germanic root is "* er _ū". It is called "Terra" in Latin, which is the name of Theia, the goddess of the earth in ancient Roman mythology. Known in Greek as "γ α _ α" (Gaia), it is the name of Gaia, the goddess of the earth in Greek mythology.

The word "tu" in Chinese first appeared in the period when western learning spread to the east in Ming Dynasty, and was first introduced by Italian missionary matteo.

Ricci, 1552- 16 10), he used this word in the geographical map of the great universe. In the late Qing Dynasty, modern western science was introduced into China, and the theory of the earth circle was gradually accepted by Chinese people. The word "Earth" (also called "earth _") is widely used, and the newspaper published the article "On the Earth" in the first month of its publication.