Answer:
Autumnal Equinox: September 22nd
Vernal Equinox: March 21st
Longest day in the Northern Hemisphere: June 21st
Longest day in the Southern Hemisphere: December 22nd
Step-by-step explanation:
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June 21: longest day in Northern Hemisphere
December 22: longest day in Southern Hemisphere
September 22: autumnal equinox
march 21: vernal equinox
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