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Meteorological versus astronomical seasons

Occasionally I’ve been asked what is the difference between astronomical seasons and meteorological seasons.  Deke Arndt of the National Centers for Environmental Information has a nice simple write-up that explains the difference at https://www.ncdc.noaa.gov/news/meteorological-versus-astronomical-seasons.

EarthSky also has a good description of what the autumnal equinox is at http://earthsky.org/astronomy-essentials/everything-you-need-to-know-september-equinox.

equinox-globe