Diurnal motion is caused by the daily motion of planet on its axis.

Eudoxus was the first to propose that the Sun is the center of the solar system. 

The most perfect shape of the Earth and Universe according to Plato is cylindrical. 

Ancient astronomers believed that the Earth did not move because there was no stellar parallax observed. 

Galileo's observation of the planets supposed the geocentric theory. 

The planet closest to the sun has the shortest period of revolution around the Sun. 

In the proposed model of Copernicus, the Earth was at the center of the universe. 

Epicycles refer to the circular paths taken by planets. 

The Second Law of Planetary Motion implies that the product of the velocity and the distance from the Sun remain the same as a planet moves about the Sun.

The First Law of Planetary Motion implies that there is a common principle that governs the orbit motion of the planets.