Tomorrow AUTUMN EQUINOX
AUTUMN EQUINOX
In the night between today and tomorrow, and more precisely to Italian 4.29 hours of Tuesday, September 23, 2014 will be the autumnal equinox has a certain effect to say because we have the impression that the summer there has not been. At least, this is what happened in most of Italy, especially in the north of the Apennines. In Piedmont, Lombardy and Veneto is as if you passed directly, without interruption, from the instability meteorological spring to the autumn. The global data when they become available, and that is in a few months will tell us whether the summer of this year was very unusual for the entire planet or whether we are to think of the provincials. 

In any case, on Wednesday, day and night have the same length, on the equator the sun will shine directly overhead and all will see him rise exactly in the east and set exactly in the west. Also on the North Pole will begin a night of six months, and the South Pole will one day just as long, although the transitional phase the Sun will be partially on the horizon and the environment will be in a kind of long twilight. All things that happen because the Earth's rotation axis is tilted by 23 ° 27 'from the perpendicular to the orbital plane (drawing): a situation that is completely random, but it makes the world and life more different, pushing the risk of boredom. 

It is worth mentioning that while the northern hemisphere of the Earth will enter astronomical autumn, the southern hemisphere enters its spring. The thing is quite obvious rationally, but remains somewhat counter-intuitive. Reflect on this strength to conceive of the contemporary world of opposites (to a lesser extent also applies to alternating day / night: time zones are an achievement of rationality still foreign to our animal nature) makes us aware of how much astronomy naive remains within us . It is one thing to know things, another calarle deeply into their own experience. 

This fact should be taken into account psychological historically when one examines the transition from the Ptolemaic system, with the Earth motionless in the center of the universe to the Copernican system centered on the Sun. If the Copernican revolution has not arrived yet in common parlance - it keeps saying the sun rises, the sun sets, the sun passes the meridian, and so on - we can understand how it was difficult to accept the new scientific reality in the seventeenth century, and how they were brave nonconformists and the Copernicus, the Kepler and Galileo, who were able to paddle against the current, denying insights and evidence disproving that looked very solid in their simplicity immediate support for a description of the universe who rejected pursuant to and seemed like an unnecessary complication. 

Similar considerations should accompany and perhaps resolve the disorientation we feel when cosmologists tell us about a Big Bang that goes back 14 billion years ago and a '"was inflation" which lasted billionths of a billionth of a billionth of a second, and he did expand the universe of the size of an atom to that of an orange. That seems a little just because we do not realize how small an atom, but it is much more than the universe expanded newborn, with the age of a few days in the 14 billion years that followed that lead us to this equinox autumn. 

In conclusion, the autumnal equinox that for those who live south of the equator, though they still called so, door spring, teaches us the relativity of points of view, the importance of knowing how to change perspective and even the danger of dogma. Of any kind.

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