Spring Solstice 2025r 2025. On the day of the autumn (september) equinox, the sun, moving along the ecliptic, crosses the celestial equator,. What to expect in space and astronomy in 2025 the new.

For those of us in the northern hemisphere, this is marked by the arrival of the spring equinox (otherwise known as the “first point of aries”). The equinox is the time of year when the sun is at.