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News from spring!


might seem the news of the year, but it is not so, because, in reality, very often, that spring starts on March 20 instead of 21. Indeed, it is more the rule than the exception. The spring, in fact, is defined as the period beginning with the spring equinox.
latter is that instant when, because of the position in which it has Earth in its orbit around the Sun, the Sun itself assumes a position perpendicular to the equator. That day, the sun rises almost exactly east and sets almost exactly in the west.
In theory, it is also the day of equal length between day and night (the word "equinox" comes from Latin and means "equal night"), but then, for a number of factors, the day lasts a bit 'more of the night. The day of March in which it falls to the equinox marks the northern hemisphere (the one where we are) the beginning of spring, while across the world, in the southern hemisphere, autumn begins, because the seasons are reversed.
And here is the astronomical explanation. As the Earth revolves around the Sun, the apparent position of the Sun moves in a circle in the whole period of one year. This circle is called the ecliptic, and is also the Earth's orbital plane projected on the celestial sphere. The other planets visible to the naked eye (Mercury, Venus, Mars, Jupiter and Saturn) appear to move along the ecliptic, because their orbits are on a level similar to that of Earth. The other circle in the sky is the celestial equator, which is the projection of the earth on the celestial sphere.
Because the axis of rotation of the Earth is tilted with respect to the plane of the celestial equator is inclined to the ecliptic. Twice a year, the Sun crosses the Earth's equatorial plane. These two points are the equinoxes.

equinox has always been assigned important meanings in all cultures. In Christianity, the vernal equinox coincided with the conception of Jesus Coming celebrated his birth on December 25, the reference date for the conception, March 25, that is, in fact, the day when we celebrate the Solemnity of the Annunciation, or the announcement of conception (virgin) and the birth of Jesus is being done to his mother Mary by the Archangel Gabriel.
Also in Christianity, the spring equinox is also the starting point for calculating the date of Easter. This is determined from year to year, the Sunday following the first full moon (full moon) after the equinox. Good
then spring! Roberto