Assertion: vernal equinox | /r/CapableOf | mark first day of spring
Facets:
value: in the northern hemisphere
type: LOCATION
value: officially
type: MANNER
Source sentences:
text: This year, the Vernal Equinox falls on Tuesday March 20 - officially marking the first day of spring, according to the astronomical calendar .
text: The vernal equinox marks the first day of spring in the northern hemisphere.
text: In the northern hemisphere, the vernal equinox marks the first day of spring and occurs when the sun moves north across the equator.