Canterbury Astrolabe Quadrant bought by British Museum

The British Museum recently raised UKĀ£350,000 to buy a rare 14th century astrolabe discovered in Kent, England in 2005. The Canterbury Astrolabe Quadrant is one of only eight such instruments in the world. (photo)

The astrolabe is believed to have been crafted in 1388 and was used to calculate the date of Easter, "determine the times of sunrise and sunset, the time in equal and unequal hours or the geographical latitude."