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Spring EquinoxThe Spring Equinox. This is the day that both both daytime and nighttime are functioning in the exact same span of time. (IE. Daytime = 12 hours, Nighttime = 12 hours = Spring Equinox.)
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13y ago
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13y ago

Sept. 21 marks the beginning of Fall, along with the color change in the trees, cool evenings and birds getting ready to fly south.

Also, the fall equinox (when days and nights are exactly the same amount of time long) marks the official beginning of fall. This always occurs on Sept 21, as the previous person to answer this question stated. %The same is true for the beginning of spring.

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12y ago

Equinox

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Q: Astronomical event that marks the beginning of fall and spring?
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