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EarthSky // Human World, Science Wire Release Date: May 01, 2015

Why do we celebrate May Day?

Happy May Day! A few words about this annual celebration, whose roots are in astronomy.

May Day. May 1 on the calendar.

May Day is an ancient spring festival in the Northern Hemisphere. It’s an astronomical holiday, one of the year’s four cross-quarter days, or day that falls more or less midway between an equinox and solstice – in this case the March equinox and June solstice. The other cross-quarter days are Groundhog Day on February 2, Lammas on August 1 and Halloween on October 31. May Day also stems from the Celtic festival of Beltane, which was related to the waxing power of the sun as we move closer to summer. At Beltane, people lit fires through which livestock were driven and around which people danced, moving in the same direction that the sun crosses the sky.

Maypole wrapping at Bryn Mawr College in Pennsylvannia in 2005. May Day festivities are an annual tradition at Bryn Mawr. Image Credit: Mike Goren via Wikimedia Commons

School children rehearsing Maypole festivity, in Gee's Bend, Alabama, 1939. Image Credit: Wikimedia Commons

A group of happy neighbors in Texas, after wrapping a Maypole. See the wrapped pole being held up? Image Credit: Rick Patrick

Wrapping a Maypole with colorful ribbons is perhaps the best known of all May Day traditions. In the Middle Ages, English villages all had Maypoles, which were actual trees brought in from the woods in the midst of rejoicing and raucous merrymaking. Maypoles came in many sizes, and villages were said to compete with each other to show whose Maypole was tallest. Maypoles were usually set up for the day in small towns, but in London and the larger towns they were erected permanently.

We’re not too far away from a time in the late 20th century when people left homemade May baskets filled with spring flowers and sweets on each others’ doorsteps, usually anonymously. I can remember doing this as a child. Maybe it’s a tradition that can be revived.

Homemade May basket left on neighbor or friend's doorstep anonymously. Nice tradition!

Bottom line: May 1 is one of four cross-quarter days, midway between an equinox and a solstice. It stems from the ancient festival of Beltane, which relates to the waxing power of the sun at this time of year. Its most recognized tradition is the Maypole dance, in which people wrap ribbons around a tall pole.