While I definitely learned a lot from these resources, like the fact ancient peoples didn’t just use sundials and devices like water clocks were a thing, I think the most surprising piece of info, which was stated in the history of time measurement video, was that Stonehenge was used to plan the planting and harvesting of crops. This was interesting to me because for some reason I thought that Stonehenge’s purpose was a mystery, and I never would have guessed that it was used as a time measurement device.