![]() ![]() In a simplified model of an Earth without continents, the interaction between the Moon's gravity and the centrifugal acceleration resulting from Earth's orbit around the center of gravity of the Earth-Moon system creates two bulges on the ocean surface. The primary driving force behind tidal motion on Earth is the gravitational pull exerted by the Moon. The declination (angle between lunar orbital plane and Earth's equatorial plane) varies between 18 and 28 degrees. The lunar node cycle produces an 18.6-year oscillation of the lunar orbit relative to the equatorial plane. The lunar node cycle refers to the precession of the Moon's orbital plane, where the lunar nodes complete one revolution in about 18.6 years.
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