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The Moon never crosses the equator because the equator is on the surface of the Earth. The Moon does cross the plane in which the equator lies (called the celestial equator).

The ascending node and descending node are points at which the Moon's orbit crosses the celestial equator (the plane of the Earths equator). The Moon crosses the same node every 27.2122 days, an interval called the draconicordraconitic month. The line of nodes, the intersection between the two respective planes, has a retrograde motion: for an observer on Earth it rotates westward along the ecliptic with a period of 18.60 years, or 19.3549° per year. When viewed from celestial north, the nodes move clockwise around the Earth, opposite the Earth's own spin and its revolution around the Sun. Lunar and solar eclipses can occur when the nodes align with the Sun, roughly every 173.3 days.

Different Answer:

The moon will appear to 'cross' the equator twice each lunar month as it moves from south to north (this happens about every 14 days).

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