On the evolution of time management. Some medieval information.

"The terms "astronomie" and "astrologie" are more or less interchangeable; it was understood that the astrological condition of the skies affects the weather and influences the seasons and times for planting and harvesting (hence even today the Old Farmer's Almanac provides detailed astrological information for the benefit of those whose labors may be affected by the skies. "Judicial" astronomy concerned the influence of the planets on the actions of humans, a subject of considerable debate."

Lots of sites. Some of which are medieval-related.

"Since the publication of Ladourie's Histoire de climat depuis l'an mil in 1967, historians have generally accepted that the European climate deteriorated after about the year 1000. They have seen this deterioration as a cause of the Great Famine of 1315-1317, a factor the Black Death of 1347, and contributing to the depression of the fifteenth century. ..."