Happy Vernal Equinox (Spring Equinox)
The Spring Equinox is an event that occurs once a year, when the Sun reaches a point in the constellation of Pisces known as the First Point of Aries.
As the Earth orbits the Sun, its poles always point at fixed positions in the sky. The north pole points toward Polaris (the Pole Star), while the south pole points towards the constellation of Octans. The planet’s orientation is fixed relative to the stars, subject to a long slow change over the millennia known as precession.
This fixed inclination means that, as the Earth travels around the Sun, each pole is sometimes angled towards the Sun, and sometimes angled away. From the Sun’s perspective, the Earth ’tilts’ backward and forward each year, and it is this ’tilt’ that causes the seasons.