Henry Carter Hull

Explores the changing ideas about the universe -- from the flat Earth to the modern-day research into black holes.

Starting from the Greenwich meridian this book takes the reader east imagining what children are doing at that moment in each of the twenty-four time zones.

Timekeeping: Explore the History and Science of Telling Time travels through the past and into the future to explore how humans have measured the passage of time. From ancient civilization's earliest calendars and shadow clocks to GPS and the atomic clocks of today, kids will track the evolution of timekeeping devices, meet the inventors of calendars and clocks, and learn interesting facts and trivia. Hands-on projects and activities include making...