Includes unique book code to scan.

Counting down the days -- Sun and moon -- Moon gazing -- The first calendars -- Solar pwer -- Weeks -- Romans to the rescue -- Calendars of the world -- Months, days, and years, oh my! -- Track the dates -- Key words.

A calendar can help people to count how long it is until their birthday. Calendars meadure days, weeks, months and years. Learn about different types of calendars and the history of measuring days , weeks, months, and years in this book.