Spring Equinox 2024 Wiki. But why does the day mark the start of spring and why only in the northern. The spring equinox (march 19, 2024) signals the start of spring in the northern hemisphere, the beginning of autumn in the southern hemisphere, and a rare moment of equal night across the.

But why does the day mark the start of spring and why only in the northern. Vernal / spring equinox 2024 the spring or vernal equinox marks the astronomical first day of spring.