Spring Equinox 2025 Australia Calendar. An equinox is one of two days in the year when the sun crosses the equator and day and night become equal in length. The spring equinox, known as the vernal equinox in the northern hemisphere, is a day on which the sun sits directly over the equator, so day and night all over the world are of equal length.

 — astrology calendar in 2025. March equinox in 2023 is on tuesday mar 21 st, 2023.