Spring Equinox 2024 Northern Hemisphere Map. The start of astronomical spring, known as the vernal equinox, occurred yesterday, march 19, 2024, at 11:06 p.m. The seasons are hemisphere dependent.
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. But why does the day mark the start of spring and why only in the northern hemisphere?.