The regular distribution of land mass and ocean floor along equator is divided 30° apart! It fits to the convection cells of the mantle underneath. Just look at this map:
This is one of the proofs of the existence of the convection cell system underneath.
The better we compare the system of convection cells and the distribution of land, ocean ridges and tectonics, the better it all fits! We have had this map on our walls for so long time! Do you want to go into the details of this distribution? Do you want to know the logic behind it?