A fixed point in Coptic Chronology: the solar eclipse of 10 March, 601
  We reconsider the description of a solar eclipse in the Coptic ostracon in the Egyptian museum, Turin, confirming its identification with the solar eclipse of 10 march 601. This provides one of very few fixed dates in Coptic chronology. We comment on the rarity of such descriptions. 
John Ray, Gerry Gilmore