Galileo Galilei was right to think that the Earth moves and rotates in more than one way. Even as you are reading this, the planet is actually orbiting around the Sun at great speed. 

Planet Earth orbits the Sun on an almost circular track. A complete cycle around this track takes Earth approximately 365 days. This is called a year.

An imaginary axis can be drawn from between the Earth's North and South Poles. This axis is set at a 23,5 degree angle. This means that our planet is slanted relative to its orbit around the Sun. 

The slanted axis of the planet combined with Earth's orbit around the Sun creates the seasons.

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