The variable star T Coronae Borealis was first observed this day from the Washington Observatory and two days later from the Cambridge Observatory outshining all stars in the vicinity. One of only ten recorded variable stars which flare in magnitude at irregular intervals, "T CrB" flared again in February 9, 1946 for only its second ever variable observation. (By John Osborne)
Source Citation
"Astronomical Phenomena and Progress," The American Cyclopedia and Register of Important Events of the Year 1866 (New York: D. Appleton and Company, 1873), 41-42.
Bob King, "Is T CrB About To Blow Its Top?" Sky and Telescope, April 20, 2016.