When Do The Four Seasons Start And End [portable]

The confusion is understandable. There isn't just one universal answer to the question, In fact, scientists, meteorologists, and astronomers use two very different systems to define the seasons.

If you celebrate May Day (May 1st) as the start of summer or Halloween (Oct 31st/Nov 1st) as the start of winter, you are following the Celtic calendar. when do the four seasons start and end