The final Square Root Day of the century will occur on September 9, 2081.
Ron Gordon, a Redwood City, California high school teacher, created the first Square Root Day for September 9, 1981 (9/9/81).
Gordon remains the holiday's publicist, sending news releases to world media outlets.
[2] Gordon's daughter set up a Facebook group where people can share how they were celebrating the day.
[3] One suggested way of celebrating the holiday is by eating radishes or other root vegetables cut into shapes with square cross sections (thus creating a "square root").