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Here on this blog, we celebrate the beginning of climatological (some call it meteorological) spring on March 1. But we also mark the start of astronomical spring, which begins this year on March 20 at 11:33 am ET. This is the date on which the days and nights are of essentially equal length. If you are interested in finding out more about the difference, you can read NOAA’s explanation at Meteorological Versus Astronomical Seasons | News | National Centers for Environmental Information (NCEI) (noaa.gov).