Syzygy produces maximum tides once every 1,600 years if the relative positions of the Sun to the Earth and the Moon to the Earth are just right.

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Syzygy occurs when the Sun, Earth, and Moon are aligned in a straight line. This alignment produces the highest tides, known as spring tides. However, the relative positions of the Sun and Moon to the Earth are constantly changing, so syzygy does not always produce maximum tides. Only when the Sun and Moon are aligned in a specific way, known as a syzygy with a perigee moon, do we get the highest tides. This occurs about once every 1,600 years.

Syzygy Produces Maximum Tides Once Every 1,600 Years If the Relative