It was around 10:30 a.m. when Nathan Read made a frightening observation at Harvard College in Cambridge, Massachusetts. "An unusual darkness came up and it spread pretty quickly." Half an hour later, Read's lecturer was "Mr. Wigglesworth unable to read the Bible by the window ”. At 12.21 p.m. he added, “Mr. W. cannot read the headline of a large Bible. - Candles have to be lit. ”And at 12:45 pm Read had to find out that he could no longer see the hands of a clock with a light background, even though the room had three windows.