![]() ![]() 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 18.6 years or 19.3549° per year. The Moon crosses the same node every 27.2122 days, an interval called the draconic month (or draconitic month). The ascending (or north) node is where the Moon moves into the northern ecliptic hemisphere, while the descending (or south) node is where the Moon enters the southern ecliptic hemisphere. The lunar nodes are the two points where the Moon's orbital path crosses the ecliptic, the Sun's apparent yearly path on the celestial sphere.Ī lunar node is either of the two orbital nodes of the Moon, that is, the two points at which the orbit of the Moon intersects the ecliptic. ( January 2018) ( Learn how and when to remove this template message) Please help to improve this article by introducing more precise citations. ![]() This article includes a list of general references, but it lacks sufficient corresponding inline citations. ![]()
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