What Time Is It?, livre ebook

Why are there twelve months in a year?
Are there diff erent kinds of time?
How does a grandfather clock work?
What was a “Nuremberg egg”?
Filled with exquisite, detailed illustrations
of numerous timekeeping devices from
every age, What Time Is It? explains how
calendars were invented, how people
kept track of time before clocks were
used, what time is, and more.