If light symbolizes God, darkness connotes everything that is anti-God: the wicked ( Prov 2:13-14 ; 1 Thess 5:4-7 ), judgment ( Exod 10:21 ; Matt 25:30 ), and death ( Psalm 88:12 ). Salvation brings light to those in darkness ( Isa 9:2 ). Although darkness is opaque to man, it is transparent to God ( Psalm 139:12 ).

Vernal equinox, a date in the spring of the year usually around March 21 and Autumnal equinox, a date in the fall of the year usually around September 23 are the days when earth experiences 12 hours of daylight and 12 hours of darkness.