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I rather think it's you whoI rather think it's you who are hung up on astronomy. The seasons are defined by common human experiences on Earth, not by star-gazing. Spring *means* the season when flowers and leaves (re)appear, birds nest, lambs are born, etc. By age-old convention, the months of Spring are March, April and May, although that may vary over time and place (and in the Southern hemisphere it is Autumn/Fall). Fall is the opposite of Spring - the season in which leaves fall. That is why it is called Fall. "Vernal" is the Latin for "of Spring". The vernal equinox occurs "during" Spring. It is not its beginning, except for the astronomically obsessed.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?