* Astronomy

The total eclipse of 20 March 1140, was recorded by William of Malmesbury in his Historia Novella, Lib. ii sec.35.: 
"During this year, in Lent, on the 13th of the Calends of April, at the 9th hour of the 4th day of the week, there was an eclipse, throughout England, as I have heard. With us, indeed, and with all our neighbours, the obscuration of the Sun also was so remarkable, that persons sitting at the table, as it then happened almost everywhere, for it was lent, at first feared that Chaos had come again: afterwards, learning the cause, they went out and beheld the stars around the Sun. It was thought and said by many not untruly, that the King [Stephen] would not continue a year in government." 

This is the Lenten eclipse reported in the The Anglo Saxon Chronicle as being on the thirteenth day before the kalends of April: 'After this, during Lent, the sun and the day darkened about the noon-tide of the day, when men were eating; and they lighted candles to eat by. That was the thirteenth day before the kalends of April. Men were greatly wonderstricken'

http://eclipse.gsfc.nasa.gov/5MCSE/5MCSE-Maps-08.pdf 

http://adsabs.harvard.edu/full/1984JRASC..78L..56B