 11th century BC - Significant persons: Encyclopedia II - Intellectual history of time - Towards time-keepingThe units of time first developed by humans would likely have been days and months (moons). In some parts of the world the cycle of seasons are apparent enough to lead to people speaking about years & seasons (e.g. 4 summers ago, or 4 floods ago). With the invention of agriculture in the 3rd millennium BC, people relied heavily on the cycles of the season for planting and harvesting crops. Most humans came to live in settled societies and the whole community relied upon accurate predictions of the seasonal cycle. This led to the developm ...
See also:Intellectual history of time, Intellectual history of time - Towards time-keeping, Intellectual history of time - Isochronous time Read more here: » Intellectual history of time: Encyclopedia II - Intellectual history of time - Towards time-keeping | 
