What would be different on Earth if the Moon did not exist?

What is the role of the ocular lens?

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

Newtons view of arrangement of the universe