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It took over 1000 years to discover, because the planets' orbits are very like circles, and a system using circles made a good model of a planet's orbit until observations became accurate enough to reach the proper answer.
What else can I help you with?
What did Johannes Kepler discover about the motion of the planet?
That they followed elliptical orbits.
Who made a model of the solar system in which each planet orbits the sun?
Galileo Galilei was the first to discover this.
Why is a moon not a planet?
A planet orbits a star such as the sun. A moon orbits a planet.
Is a planet a moon?
No. A moon orbits around a planet. A planet orbits around the sun.
How is planet different from moon?
A planet orbits a star whereas a moon orbits a planet.
What is something in the solar system that orbits a planet?
A moon orbits a planet.
What moves in a circle around a planet or star?
A planet orbits a sun, a moon orbits a planet
A small planet that orbits the sun?
Mercury, is the smallest planet that orbits the sun.
What planet orbits around the sun and crosses another planet orbits?
Saturn
How is a moon different from a dwarf planet?
Generally, a dwarf planet orbits only the sun, whereas a moon orbits a planet, which in turn orbits a sun.
Does the earth orbit the planet?
No. Earth is a planet. It orbits the sun, which is a star.
How do the orbit of planets differ from the orbit of moons?
A planet orbits a star. A moon orbits a planet or dwarf planet.
