time measurements

Explains the origin of standard time and the international system of time zones, and discusses Greenwich Mean Time and Coordinated Universal Time, time zones in the United States, daylight savings time, and the cases of India and Australia.

Introduces readers to the basic features of calendars and clocks, such as dates and numerals. Readers will learn how to use these features to track time and keep organized.

"The mathematical concepts of distance, rate, and time are explored as students partake in their school's annual field day; teaches about proportions, ratios, and cross products; and includes a discovery activity, connections to science and engineering, and mathematical vocabulary introduction"--Provided by publisher.

Introduces minutes, hours, years, and other basic units of time.

Uses humor in both text and illustrations to describe the history of clocks and calendars and how important they have become.

Explains time measurement from sundials to atomic clocks, and discusses time zones and time zone maps.

"Introduces types of timelines and how they are used"--Provided by publisher.

Simple text, photographs, and illustrations describe clocks and units of time and how activities can be measured by time.

Traces the history of measuring time, from the Stone Age to the twenty-first century.

Examines how time has been measured through history, by such methods as observation of natural cycles and different kinds of clocks and watches.