Variable hours in a changing society -- Towers, pillows, and graphs: variation in clock design -- Astronomical time measurement and changing conceptions of time -- Geodesy, cartography, and time measurement -- Navigation and global time -- Time measurement on the ground in Kaga domain -- Clock-makers at the crossroads -- Western time and the rhetoric of enlightenment

A unique insight into the measurement of time and its applications, at an introductory level.

In this project researchers developed a practical, low-cost chemical analyzer for real-time monitoring of trihalomethanes (THMs) and haloacetic acids (HAAs) in drinking water distribution systems. THMs and HAAs are possibly harmful to humans if ingested. For this reason the US Environmental Protection Agency established maximum contaminant levels. Future regulations might lower the MCL of these substances. Real-time monitoring of THMs and HAAs will become necessary for future regulatory compliance.

Anthony F. Aveni gathers specialists from diverse fields to discuss temporal concepts gleaned from the people of Mesoamerica and the Andes. Essays address how they reckon and register time and how they sense time and its moral dimensions. To them, time is a feature of the process of perception, not just the sharp present ingrained in Western minds.