... In this chapter, we explore many different ways to measure and record time. ... Any proposed calendar must be compatible with observations (100-day years are contrary to observations!) ... Three-minute "hour glasses" to time eggs are still common in kitchens. ... How could we lengthen the amount of time it takes to empty one of the bottles? ... In the activities of Chapter 1, we found that midday, when the Sun is highest and directly South in the sky, rarely corresponds to noon, as told by the clock...