Why Do Tides Stop Rising Before the Moon Does?

Imagine you are pulling your little brother across a carpet. You pull hard, but he does not jump to your hand instantly. He slides over a bit because he is heavy and the carpet holds him back. This is how tides work with the moon.

The moon pulls on the ocean water like a giant magnet. When the moon moves high above your head, it starts pulling the water up. But the water does not just pop up instantly. It takes time to move. The oceans are huge and heavy, so they react slowly.

Also, the shape of the land matters. Oceans sit in big basins that look like bathtub full of jelly. When you push jelly on a plate, it wobbles. It does not stay still. As the moon moves across the sky, the water tries to follow it but gets stuck or delayed by friction.

So, even though the moon is moving away from your head, the water continues to pile up for a while longer. By the time the moon has moved far to the side, the tide reaches its highest point. The high tide happens later than the moon's position because the water is late to the party!