What "holiday" is celebrated by eating root vegetables cut into shapes with square cross-sections?

How many days like that are there within a century?

(In reply to re: Thoughts.... small hint by Ady TZIDON)

There are nine square root days each century:
01/01/xx01 : January 1st for the (1²) first year
02/02/xx04 : February 2nd for the (2²) fourth year
03/03/xx09 : March 3rd for the (3²) ninth year
04/04/xx16 : April 4rd for the (4²) sixteenth year
05/05/xx25 : May 5th for the (5²) twenty-fifth year
06/06/xx36 : June 6th for the (6²) thirty-sixth year
07/07/xx49 : July 7th for the (7²) forty-ninth year
08/08/xx64 : August 8th for the (8²) sixty-fourth year
09/09/xx81 : September 9th for (9²) the eighty-first year

As the day and month are based upon the (perfect) square root of the two-digit year, no square root day is observed in the last three months of a year. The first square root day was observed 09/09/1981, thus the unofficial holiday has been observed only four times as yet.

Edited on July 9, 2015, 12:34 pm

Posted by Dej Mar on 2015-07-09 06:20:04