The sun is moving in circles around the galaxy center and the stars around it as well. In our solar system, the planets are orbiting around the sun, each specific period of time.
Planets are orbiting the sun, each of them in a time period different from the other. The number of planets in our solar system is nine planets, and there are also asteroids, comets, and meteorites. Some ancient astronomers believed that Earth was flat, but Aristotle (384-322 BC) said that Earth is spherical.
It was believed that Earth is the center of the universe and that the planets, the sun, and the stars are all orbiting Earth. This theory was supported by Ptolemy and was believed for 1000 years by scientists. Nicholas Copernicus (1473-1543) was the first to doubt the theory said Earth is flat and said "Sun is the center of the universe and not the Earth", but his theory was met with fierce criticism from the clergy in his reign.
It was believed that Earth is the center of the universe in the Middle Ages and before, that it's the most important part of the universe. Galileo was imprisoned by order of the clergy of his time because of his belief that Earth is not the center of the universe and that the Sun is the center of the universe, he was forced to retreat from his opinion. Then came Johannes Kepler, who proved that Earth is not the center of the universe and it is orbiting the sun, also other stars have nothing to do with the movement of the sun and that each star is a sun with an orbit alone and each star has its own planetary system.
Thanks to the efforts of astronomer Tycho Brahe, Kepler explained that the orbits are not circular, but elliptical or oval and that the orbit of the planets has two axis. The period in which the planet revolves around itself is called the "day" and the period when the planet revolves around its star as "the Year." The planet near the sun is has a shorter orbit than the planet farther away from the sun. The year of Earth consists of 365 days and a quarter,
so the normal year takes 365 days and the leap year 366 days to make up one quarter every four years. The planet lasts in its orbit like a spiral around its axis for a long time, estimated at millions of years, the period when the planet revolves around itself called "day". And what causes the difference between night and day is the orbit of Earth around itself every 23 hours and 56 minutes. It is also what causes our vision of the stars coming from east to west at night. The rotation of Earth around the sun causes the four seasons of the year to occur because of the rotation of Earth around itself with an axis that is 23 degrees and half the Earth's rotation level, And the severity of heat and cold.
Nicolas Copernicus in 1473. he was a priest but also a scientist and astronomer, he realized that Earth is not the center of the universe, this theory called "Copernicus system", Copernicus died in 1543.
Ptolemy Theory. he thought that Earth is the center of the universe and all the planets and sun is orbiting Earth, while the stars are stationary, and it was thought that the planets are orbiting in a small circles.
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| Nicolas Copernicus. |
Planets are orbiting the sun, each of them in a time period different from the other. The number of planets in our solar system is nine planets, and there are also asteroids, comets, and meteorites. Some ancient astronomers believed that Earth was flat, but Aristotle (384-322 BC) said that Earth is spherical.
It was believed that Earth is the center of the universe and that the planets, the sun, and the stars are all orbiting Earth. This theory was supported by Ptolemy and was believed for 1000 years by scientists. Nicholas Copernicus (1473-1543) was the first to doubt the theory said Earth is flat and said "Sun is the center of the universe and not the Earth", but his theory was met with fierce criticism from the clergy in his reign.
 |
| Ptolemy Theory. |
It was believed that Earth is the center of the universe in the Middle Ages and before, that it's the most important part of the universe. Galileo was imprisoned by order of the clergy of his time because of his belief that Earth is not the center of the universe and that the Sun is the center of the universe, he was forced to retreat from his opinion. Then came Johannes Kepler, who proved that Earth is not the center of the universe and it is orbiting the sun, also other stars have nothing to do with the movement of the sun and that each star is a sun with an orbit alone and each star has its own planetary system.
 |
| Earth's Orbit. |
Thanks to the efforts of astronomer Tycho Brahe, Kepler explained that the orbits are not circular, but elliptical or oval and that the orbit of the planets has two axis. The period in which the planet revolves around itself is called the "day" and the period when the planet revolves around its star as "the Year." The planet near the sun is has a shorter orbit than the planet farther away from the sun. The year of Earth consists of 365 days and a quarter,
 |
| The four seasons. |
so the normal year takes 365 days and the leap year 366 days to make up one quarter every four years. The planet lasts in its orbit like a spiral around its axis for a long time, estimated at millions of years, the period when the planet revolves around itself called "day". And what causes the difference between night and day is the orbit of Earth around itself every 23 hours and 56 minutes. It is also what causes our vision of the stars coming from east to west at night. The rotation of Earth around the sun causes the four seasons of the year to occur because of the rotation of Earth around itself with an axis that is 23 degrees and half the Earth's rotation level, And the severity of heat and cold.
Nicolas Copernicus in 1473. he was a priest but also a scientist and astronomer, he realized that Earth is not the center of the universe, this theory called "Copernicus system", Copernicus died in 1543.
Ptolemy Theory. he thought that Earth is the center of the universe and all the planets and sun is orbiting Earth, while the stars are stationary, and it was thought that the planets are orbiting in a small circles.
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