Here's why:
* The vernal equinox is a point in space, not a physical object. It's the point where the Sun crosses the celestial equator from south to north. This point is constantly shifting due to a phenomenon called precession.
* Precession is the slow wobble of Earth's axis. This wobble causes the celestial poles and equinox points to move slowly across the sky over thousands of years.
* The vernal equinox was in the constellation of Aquarius in the past. Due to precession, it has moved into Pisces.
* The vernal equinox will continue to move. In the future, it will eventually move into the constellation of Cetus.
So, while the vernal equinox was in Aquarius in the past, it is currently in Pisces and will continue to move into other constellations in the future.
