0 either of the two occasions in the year when the centre of the sun is directly above the Equator, and day and night are approximately equal in length:
1 either of the two times during the year when the sun crosses the equator and day and night are of equal length, about March 21st and September 23rd
We suppose that rainfall and cloudiness can interfere with the equinox signal for flowering in the study areas.
These are associated with horizon positions of the sun at the equinoxes and solstices.
He defines the points of the orb that are called equinoxes and solstices.
Significant differences between equinox and annual values are indicated by asterisks.
The semi-evergreen species initiated leaf flush (bud break of vegetative bud) earlier around the spring equinox.
At that point in time, the calendar year would be 139 days ahead of any observed solar event, such as the equinox.
If these happened to be juxtaposed with an equinox, eclipse, or planetary conjunction, so much the better.
At the time when the two poles abide at the equinox points, the two motions will intersect at a right angle.
