The movement of the earth's translation around the sun lasts a little more than 365 days, making it necessary to introduce a leap year (one more day every 4 years).

This movement, combined with the inclination of the earth's axis originates the seasons. 

The seasons in the North and South hemisphere are opposite: when it is winter in the North, it is summer in the South and vice versa. 

Seen from the earth, it seems to us that the sun is the one that moves during the year, going through the constellations of the zodiac.