Line of nodes

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Related to Line of nodes: descending node
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The orbital planes cross each other at a line of nodes resulting in at least two, and up to five, solar eclipses occurring each year; no more than two of which can be total eclipses.
A transit of Venus across the Sun's face can occur only when the planet reaches inferior conjunction within two days of when Earth is on the line where the tilted orbital planes intersect, called the line of nodes.
Simultaneous close groupings of all five lines (Earth-Moon, Earth-Sun, major axis of the Moon's orbit, lunar line of nodes, major axis of Earth's orbit) did not occur at all in the 20th century, because two of these lines currently can coincide only in September, while another pair can align only in early January.