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spring equinox |
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In the Northern hemisphere, March 21 or 22; on these dates, the rays of the sun are striking vertically at noon at the equator (0 degrees latitude), for the earth is in such a position in its orbit that the axis is tilted neither toward nor away from the sun. For latitudes above the equator, the dates are earlier then these dates. [Lutgens, Frederick K. et al. The Atmosphere-An Introduction to Meteorology 6th ed. pg. 29; 1995; Prentice-Hall: New York.] Source: Atmospheric Chemistry Glossary
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