The former is an average value and is always retrograde. Eclipses occur when either the new or full moon occurs close to the nodal axis.Įphemerides often give two different values for the moon's node: for the so-called mean moon's node and the true moon's node. retrograde) direction around the zodiac and take 18 years, 7 months and 9 days to make one complete revolution. The series of moon's nodes move in a clockwise (i.e. Two weeks later the moon intersects the ecliptic plane going in a southerly direction and this point of intersection is called the moon's south node. The point at which the moon crosses the plane of the ecliptic when moving in a northerly direction is called ascending moon's node or north node. The moon can be located either north or south of the plane of the ecliptic. These points of intersection occur because the plane of the moon's orbital path is inclined to the sun's (in reality the earth's)orbit at an angle of 5 degrees and 9 minutes. There are two points of intersection which are situated directly opposite each other, forming the nodal axis.
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