Some high tides are higher than others.
We talk about what causes especially low tides called neap tides and high tides called spring tides. The sun's mass is 27 million times that of the moon, but the sun is 390 times farther from Earth than the moon. So although the sun's gravity affects earthly tides, the moon's gravity has more of an effect because of the moon's nearness to Earth. The influence of the sun on earthly tides is about 45 per cent that of the moon. That's why the strength of the tides varies throughout the month, as the moon moves in its orbit.