2024 Solstice Dates. This is the first day of astronomical summer and occurs as the sun reaches its most northerly or southerly path in the sky. The summer solstice happens on thursday, june 20, 2024!

An equinox is one of two days in the year when the sun crosses the equator and day and night become equal in length. An equinox is one of two days in the year when the sun crosses the equator and day and night become equal in length.