Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 9 - Think and Explain: 78

Answer

While the Earth spins with a 24-hour period, the Moon revolves around the Earth. Thus, it does not appear overhead to observers every 24 hours, but instead, about every 24 hours and 50 minutes. So the entire cycle, containing 2 high tides and 2 low tides, takes about 24 hours and 50 minutes, meaning high tides are separated by roughly half that time interval.

Work Step by Step

This is discussed on page 168.
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