Orbita

An orbit is the path that an object takes in space when it goes around a star, a planet, or a moon. It can also be used as a verb. For instance: "The earth orbits around the Sun." The word 'revolves' has the same meaning.

Many years ago, people thought that the Sun orbits in a circle around the earth. Every morning the Sun came up in the east and went down in the west. It just seemed to make sense that it was going around the earth. But now, thanks to people like Copernicus and Galileo Galilei, we know that the Sun is the center of the Solar System, and the earth orbits around it. Since a satellite is an object in space that revolves around another object, the earth is a satellite of the sun, just like the moon is a satellite of the Earth! The sun has lots of satellites orbiting around it, like the planets, and thousands of asteroids, comets, and meteoroids. The Earth just has one natural satellite (the Moon), but there are lots of artificial satellites orbiting the earth.

When people first began to think about orbits, they thought that all orbits had to be perfect circles, and they thought that the circle was a "perfect" shape. But when people began to study the motions of planets carefully, they saw that the planets were not moving in perfect circles. Some of the planets have orbits that are almost perfect circles, and others have orbits that are longer and less like a perfect circle.

Source: wikipedia.org