March 20-21 The Vernal Equinox Spring arrives when the earth is tilted so that the sun is directly over the equator in the northern parts of the world, the first day of spring is on or about March 21.
(the earth; is tilted; ) (the sun; is directly; over the equator in the northern parts of the world) (the first day of spring; is; on or about March 21) Context(the first day of spring is,List([152, 178))):(The Vernal Equinox Spring; arrives; T:when the earth is tilted so that the sun is directly over the equator in the northern parts of the world)
the first day of spring is,List([152, 178))
the earth the sun the first day of spring The Vernal Equinox Spring
is tilted is directly is arrives
over the equator in the northern parts of the world
on or about March 21
T:when the earth is tilted so that the sun is directly over the equator in the northern parts of the world