1973 Comet Kohoutek, first sighted #OTD by Czech astronomer Luboš Kohoutek. http://j.mp/1OXLs9O http://pic.twitter.com/ZFDtRinIV7
— On This Day in Math (@OnThisDayinMath) March 7, 2016
from http://twitter.com/OnThisDayinMath
on: March 07, 2016 at 03:00PM