How long does it take for Mercury to rotate? How many days is the rotation period of Mercury

In 1889, the Italian astronomer Giapparilli concluded that Mercury's rotation time and orbit time were both 88 days. It wasn't until 1965 that American astronomers measured the exact periodic days of Mercury's rotation.

At some point, in some part of Mercury's surface, on the same Mercury day, when an observer observes (at the time of the Sun's rise), the Sun can be seen to rise first, then recede and finally set, and then rise again. This is because during a period of about four days of perihelion, Mercury's orbital velocity is exactly equal to its rotational speed, so that the apparent motion of the Sun stops, and at perihelion, Mercury's orbital velocity exceeds its rotational speed; As a result, the Sun appears to move retrogradely, and four days after perihelion, the Sun resumes its normal apparent motion.

It wasn't until 1965 that radar observations were used, which rejected the idea that Mercury was tidalally fixed to the Sun: the rotation kept Mercury facing the Sun the same at all times. Mercury's orbital velocity is 3:

2, which means that the time to rotate three times is the time to revolve twice around the sun; Mercury's orbital centrifugation holds this resonance steady. Originally astronomers thought it had fixed tides because Mercury was in the best position to be observed, always showing the same side at the same moment in the 3:2 resonance, as if it were completely fixed.

Mercury's rotation is 59 times slower than Earth's.

Because of Mercury's orbital velocity ratio of 3:2, a sidereal day (the period of rotation) is about one Earth day, and one solar day (the time between the two meridians of the Sun) is about 176 Earth days.

Citation: Mercury's rotation period is 58 Earth days and 12 Earth hours in diameter; 4,900 km, 3 times smaller than the Earth.

Gravitational pull: Slightly greater than the Earth's gravitational pull of 1 3, which means that your weight on Mercury is only 3 1 of Earth's

Satellite: No.

Annual length: The average speed of the revolution is 48 kilometers per second, which is equal to 88 Earth days in the atmosphere: almost nothing, closest to the Sun.

Temperature: 427 degrees during the day, minus 183 degrees at night.

Cliffs: 3 km high.

Calorie Basin: There are craters with a diameter of up to 1,300 km.

There may be ice inside the deep crater.

Mercury's rotation period is 88 days, making it the innermost and smallest planet of the eight planets in the solar system and the closest planet to the Sun. Known as Chenxing in China, it has the largest orbital eccentricity of the eight planets. It orbits the Sun once every Earth day, and it also rotates three times per revolution.

Mercury has the smallest orbital inclination of any planet in the solar system. The perihelion of Mercury's orbit has 43 arc seconds (arc seconds) more precession per epoch than Newtonian mechanics, a phenomenon that was not explained by Einstein's general theory of relativity until the 20th century.

Mercury is a terrestrial planet that, due to its proximity to the Sun, appears only as a morning star in the early hours of the morning or as an evening star at dusk. Unless there is a solar eclipse, Mercury is usually invisible under the sun's rays. Hengyu.

With a rotation period of 58 days and 646 days and an orbital period of 88 days, Mercury is the innermost and smallest planet of the eight planets in the solar system, and the closest planet to the Sun. Known as Chenxing in China, it has the largest orbital eccentricity of the eight planets.

Galaxies were subsumed into nebulae in the early days, and it was not until 1924 that the existence of galaxies was formally established after the distances of galaxies outside the Andromeda River were accurately determined.

Galaxies are not evenly distributed in space and tend to clump together. A few come in groups of threes and twos, and a large number may be in hundreds. People also call this kind of group "Star Beat Group".

Inside galaxies, the star moves in two ways: it rotates around the core of the galaxy while moving randomly within a certain range.

Mercury's orbital period is days, almost 88 days.

Since Mercury is the closest planet to the Sun, it takes the shortest time to orbit the Sun of any planet in the solar system. Its revolution period is about 88 days, nearly 3 months. The time of day and night on Mercury is equivalent to 176 days on Earth.

Among the eight planets in the solar system, Mercury is the closest to the Sun compared to the other seven planets, with a distance of about 57.9 million kilometers, which is why Mercury is attracted by the Sun's gravitational pull more than the other seven planets.

Features of Mercury

Mercury, like Earth, is a planet made of rocks, mostly composed of about 70% metal and about 30% silicate materials. The surface of Mercury has craters, plains, and other geological formations similar to those of our moon. Mercury has a weaker magnetic field than Earth and does not have an atmosphere like Earth.

Mercury also has north and south poles, with a large amount of ice in the Arctic region (obtained by spacecraft). Mercury has more molten iron cores than any other planet in the solar system, accounting for 42% of the total volume of Mercury.

When Mercury is at a great elongation of the Sun, it is the best time to see Mercury. Since Mercury's Goshen orbit is within the Earth's orbit, it can only be seen in the night sky in the morning when the sky is not bright and shortly after sunset in the evening. In addition, Mercury's orbit is too close to the Sun, so when viewing Mercury, it will also be affected by the Sun's strong afterglow, and it will not be easy to see.