What Is Summer Equinox 2024. As with the spring equinox this is a point of seasonal equilibrium with days and nights being. An equinox is one of two days in the year when the sun crosses the equator and day and night become equal in length.
Thursday, june 20 is the official first day of northern astronomical summer for 2024 โ summer solstice โ which is the longest day of the year for this half of the. An equinox is one of two days in the year when the sun crosses the equator and day and night become equal in length.