Question

what is the causes of tides

Answer 1

The strong gravitational pull of the sun and the moon on earth's surface causes the tides.

Answer 2

The moon's gravitational pull on the earth is strong enough to tug the oceans into bulge.

(The extra 50 minutes is caused by the distance the moon moves each day as it orbits Earth).

The sun and the tides. "Solartides" are caused by the sun's gravitational pull and are weaker than lunar tides.