Assertion: vernal equinox | /r/HasProperty | 21 march
Facets:
Source sentences:
text: Earth Day was initially celebrated on the vernal equinox, 21 March 1970.
text: Referring back to the precession of the Equinoxes, as the Sun crosses one constellation in the Northern Hemisphere's spring Equinox (March 21), it will cross the opposite sign in the spring Equinox in the Southern Hemisphere (September 21).