The Story of Clocks and Calendars  
By Betsy Maestro
Illustrated by Giulio Maestro

     When the year 2000 hit, everyone considered it a mile-stone in human history…but humans have been around way longer than 2004 years, right? So what did ancient civilizations use to help them measure the time of the seasons and months? Which of these forms helped the creation of the Gregorian Calendar, which our calendars today are a result of? All these questions and more are answered.

   There are amazing facts in this book about the measurements of time and space throughout the history of humankind. I definitely recommend this book for anyone who has a peeking interest in just how humans came up with the idea of time and keeping up with it.