Mod sceal þe mare, þe ure mægen lytlað.
Either of the two occasions, six months apart, when day and night are of equal length
Vernal Equinox (Spring)
The Spring Equinox, or the March Equinox or Vernal Equinox, signals the beginning of spring and the renewal of the Earth as plants begin to bloom again and animals come out of hibernation.
The First Point of Aries is the location of the vernal equinox, and is named for the constellation of Aries. It is one of the two points on the celestial sphere at which the celestial equator meets the ecliptic plane, the other being the First Point of Libra, located exactly 180° from it.
Autumnal Equinox (Fall)
The first day of autumn and the changing of the guard with the seasons. Usually falls on or around September 21 and one of two days in the year when there is 12 hours of day and 12 hours of night and is the time of year that the harvesting of crops happens, preparing for the winter months ahead.
The word solstice literally means "Sun stands still," and that's exactly what appears to happen during a solstice point from our perspective here on Earth.
The day of the solstice is either the longest day of the year (summer solstice) or the shortest day of the year (winter solstice) for any place outside of the tropics.
Summer Solstice is another power gate of the Wheel of the Year, the marriage of Heaven and Earth on the longest day and shortest night of the year. This solar high point is a time of fertility and growth, heralding the long lazy days of summer.
In the Northern Hemisphere, the solstice that occurs on December 21 or 22, marking the beginning of winter and the day of the year with the shortest period of sunlight.
Stonehenge (super) Durrington Walls
Summer Solstice 2016