Newtonmas

At Christmas, 1890, or Newtonmas, 248, for the first time, the members of the Newtonkai, or Newton Association, met in the Physical Laboratory of the Imperial University, to hear each other talk, to distribute appropriate gifts, and to lengthen out the small hours with laughter and good cheer.

Olivia Judson, an evolutionary biologist, recommends celebrate Newtonmas on December 25th and ten extra days representing the interval between Newton's birth dates on the Julian and Gregorian calendars.