The vernal equinox occurs around March 20 and the autumnal equinox around September 23
As of today, we officially have “Spring”. At 05:06 on Wednesday morning the vernal equinox has begun.
The vernal equinox occurs around March 20 and the autumn one around September 23.
The vernal and autumnal equinox refer to areas in the northern hemisphere, as on the corresponding dates in the southern hemisphere the seasons are opposite. At the points of the two poles the equinox has no meaning, while at the points of the Equator the equinox is permanent.
In astronomy, the equinox is the sidereal day on which the center of the sun’s disc is an equal length of time above and below the horizon of each place, that is, it traces equal arcs (day and night), and during which the sun’s rays fall vertically on the equator.
The phenomenon is due in the orbit of the earth around the sun and the tilt of its axis of rotation. As the Earth orbits the Sun, and because its axis of rotation is not perpendicular to the plane of orbit, the length of the day changes. Twice a year the Earth is in such a position that the sun’s rays fall completely vertically on the equator.
The phenomenon of the equinox occurs in all the planets of each solar system that have an inclination of the axis of rotation with respect to the plane of orbit.
Source: Skai
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