Vernal Equinox-Equality. Day and Night are of equal length. Summer Solstice-Sun,Solar. Longest day of the year. Autumnal Equinox-Equality. Day and Night are of equal length. Winter Solstice-Sun, Solar. Longest night of the year, and beginning of Winter. Although very cold in most regions, after this period the Sun is reborn and days begin to get longer.
