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On March 20th, at 13 hours and 31 minutes, the autumn equinox will take place. At this point the sun stops illuminating directly the Southern Hemisphere to begin to do it over the terrestrial Northern Hemisphere. This marks the beginning of autumn in the Southern Hemisphere and the beginning of spring in the Northern Hemisphere. When the sun in his movement over the Earth’s surface reaches the Equator, sun’s rays fall perpendicularly upon the Earth, causing daylight and night become equally long, what is known as “equinox”. This astronomical phenomenon occurs twice a year, in March and in September. Equinoxes occur in the same dates both for Northern and Southern Hemisphere; so that when the autumn equinox takes place in the Southern Hemisphere, in the Northern Hemisphere begins the spring equinox and vice versa, depending on whether the sun’s apparent movement upon the Earth is from South to North or from North to South. |
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