Autumnal Equinox: Google honors the first day of Autumn
Autumnal Equinox
Finally ... summer officially today. 05.29 On the morning of September 23 starts the autumnal equinox in the northern hemisphere, marking in this way and the "official" beginning of autumn this year, and Google Doodle spends it. 

The Google honored today with the doodle of the first page of the famous search engine, the first day of Autumn. 

The equinox occurs twice a year, when the earth's axis is aligned parallel to and at right angles to the axis of the sun. At this time the Sun is in line with the vertical equator of the earth, so that day and night have equal length at any point of the earth's surface. The equinox occurs around March 20 and September 22. 

At this point the deviation of the axis of the earth is zero at the sun. The name equinox comes from the Greek words equal and day, while international same name, equinox, comes from the Latin aequus (equal) and nox (night), because during the equinox, the night and day have approximately the same length of time . 

The autumnal equinox is about September 23 when the Sun crosses from north to south. 
The names spring and autumn equinox is relevant and related to the temperate zone of the northern hemisphere, and the corresponding dates in the southern hemisphere seasons there are opposite, while in both polar and tropical areas there is such a divergence time. 
With information from Wikipedia. 

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