Step from winter to spring

The equinoxes (from the Latin aequinoctium (aequus nocte), "equal night") are the times of the year when the Sun is located in the plane of the celestial equator. That day and for an observer on the terrestrial equator, the Sun reaches the zenith (the highest point in the sky in relation to the observer, which is just above his head, that is, at 90 °). The parallel of declination of the Sun and the celestial equator then coincide.

It occurs twice a year: on March 20 or 21 and on September 22 or 23 of each year.

On the dates when the equinoxes occur, the day lasts approximately equal to that of the night in all places on Earth. Although the word equinox refers to an equality, this is not the case due to the size of the sun (with respect to its central point), and atmospheric refraction, which causes differences in the duration of the day at different latitudes.

At the equinox, the opposite annual season change occurs in each hemisphere of the Earth.
In astronomy it is called the Aries point or vernal point to the point of the ecliptic from which the sun passes from the southern celestial hemisphere to the northern hemisphere, which occurs at the March equinox (beginning spring in the northern hemisphere) and autumn in the southern hemisphere). The planes of the celestial equator and the ecliptic (the plane formed by the Earth's orbit around the sun or the apparent movement of the sun over a year) are cut into a straight line, which has the Aries point at one end. the end diametrically opposite the Libra point.
Actually, none of the equinoxes is in the constellation that names them, due to the precession: the first point of Aries is in Pisces.
Happy Spring