In contrast, when the landmass is at 90 to the earth–moon system, the water around it is at low tide.
Therefore, each landmass is exposed to two high tides and two low tides during each period of rotation of
the earth [3]. Since the moon rotates around the earth, the timing of these tides at any point on the earth
will vary, occurring approximately 50 min later each day [4].[12]
The moon orbits the earth every 29.5 days, known as the lunar cycle [4] (fig. 4).