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A 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. 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 Moon completes one orbit around the Earth in 27.32166 days. The two points at which the Moon crosses the ecliptic are known as its orbital nodes, shown as "N1" and "N2" (ascending node and descending node, respectively), and the line connecting them is known as the line of nodes.
A total solar eclipse will occur at the Moon's descending node of orbit on Monday, September 14, 2099, [1] with a magnitude of 1.0684. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth.
In the case of objects outside the Solar System, the ascending node is the node where the orbiting secondary passes away from the observer, and the descending node is the node where it moves towards the observer. [5], p. 137. The position of the node may be used as one of a set of parameters, called orbital elements, which
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This is an accepted version of this page This is the latest accepted revision, reviewed on 15 February 2025. Astronomical event where one body is hidden by another For other uses, see Eclipse (disambiguation). "Total eclipse" redirects here. For other uses, see Total eclipse (disambiguation). Not to be confused with Eclipes. Totality during the 1999 solar eclipse. Solar prominences can be seen ...
So the Moon's orbit crosses the ecliptic at two points or nodes. If a New Moon takes place within about 17° of a node, then a solar eclipse will be visible from some location on Earth. [5] [6] [7] At an average angular velocity of 0.99° per day, the Sun takes 34.5 days to cross the 34° wide eclipse zone centered on each node.
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