The Earth

Things to remember

• The earth moves round on its axis as well as in its orbit around the sun. The motion of the earth on its axis is called diurnal motion and a complete round on its axis is called a rotation.
• A complete round around the sun is called revolution.
• It is the third planet from the sun at a distance of about 150 million kilometers.
• It takes 365.256 days for the Earth to travel around the Sun and 23.9345 hours for the Earth rotate a complete revolution. 
• A normal year is taken to have 365 days and an extra day is added every four years to the leap year.