Which sea tide comes four times a day?

As Fabrice Neyret writes, the tide is all about harmony; how easily water can move to and fro in a period of 12 hours and 25 minutes, the time the moon and the sun gets together or opposed, to lift the water by gravitational pull. read more

Sea tides are triggered my Moon twice a day, causing about 0.5 to 1m vertical displacement on deep ocean. But the real thing is how the water body react, with the channeling of coasts and floor. At the end it’s a vibrating mode as when hitting flesh periodically. read more

A solar day is 24 hours while a lunar day is 24 hours and 50 minutes because, by the time Earth has completed one rotation the Moon has moved in its orbit by enough to account for that shift. Those factors, taken together, mean that the tide cycles shift by about 50 minutes per day and that there are two not quite monthly sets of spring and neap tides. read more

The tides are the response of the earth to a driving force that comes from the gravitational field of the moon and sun. For simplicity, let’s consider a day when the sun and moon are aligned, as seen from the earth (i.e. new moon). read more