 The Moon's orbit around Earth is elliptical, which causes the Moon to be closer to Earth and farther away at different times.The Moon and the Sun are aligned every two weeks, which results in spring tides, which are 20% higher than normal.During the period of the new moon, the Moon and Sun are on the same side of Earth, so the high tides or bulges produced independently by each reinforce each other (and has nothing to do with the spring season).