Assertion: moon's position | /r/CapableOf | shift around the ecliptic
Facets:
value: in a period of 18.59992 years
type: TEMPORAL
value: gradually
type: MANNER
value: these crossing points
type: TEMPORAL
Source sentences:
text: Due to precession of the Moon's orbital inclination, these crossing points, the nodes and the positions of eclipses, gradually shift around the ecliptic in a period of 18.59992 years.