Medieval Monks Shed Light on Volcanic Eruptions and Climate Impact.

Medieval monks recorded the brightness and color of lunar eclipses, which helped researchers accurately date some of the biggest volcanic eruptions in history. The eruptions, which occurred between 1100 and 1300, were responsible for the vanishing moon and cooling summer temperatures, which could bring ruin to agricultural crops. The collective effect of the medieval eruptions on Earth's climate may have led to the Little Ice Age. The findings are significant as the interval from 1100 to 1300 is known to be one of the most volcanically active periods in history.