sun, or they watched the moon. The lunar calendar is probably the oldest in mankind's history. Readers learn about a variety of time-keeping devices invented throughout history, such as the sundial, the shadow clock, the star clock, and the water clock. The author explains how the calendar we use today evolved from the Julian calendar introduced by Julius Caesar in 45 B.C. Readers learn how the first mechanical clocks worked, and why people required more and more precise measurements of time. Factory labor, railroad travel, and radio programming made standardized time a fact of modern life. Time keeping became a personal matter with the invention of pocket clocks or watches, and wristwatches developed during World War I. Modern society is obsessed with time, and the quest for deeper space exploration will make our need for higher degrees of accuracy even more critical in the future.  (less)

sun, or they watched the moon. The lunar calendar is probably the oldest in mankind's history. Readers learn about a variety of time-keeping devices invented throughout history, such as the sundial, the shadow clock, the star clock, and the water clock. The author explains how the calendar we use today evolved from the Julian calendar introduced by Julius Caesar in 45 B.C. Readers learn how the first mechanical clocks worked, and why people required more and more precise measurements of time. Factory labor, railroad travel, and radio programming made standardized time a fact of modern life. Time keeping became a personal matter with the invention of pocket clocks or watches, and wristwatches developed during World War I. Modern society is obsessed with time, and the quest for deeper space exploration will make our need for higher degrees of accuracy even more critical in the future.  (less)

boudoir and desk clocks, along with fine pocket watches, which he made and sold in unprecedented numbers. During World War I, wristwatches were issued in the military for their greater convenience. Returning veterans brought them home, and a new fashion was created. In the 1950s, Bulova developed the Accutron, the first electronic watch, which was accurate to keeping time to within two seconds a day. During the 1960s, NASA asked the company to bring its timing expertise to computers for the Space Program. A Bulova timer was placed on the moon's Sea of Tranquility to control the transmissions of vital data through the years.  (less)

boudoir and desk clocks, along with fine pocket watches, which he made and sold in unprecedented numbers. During World War I, wristwatches were issued in the military for their greater convenience. Returning veterans brought them home, and a new fashion was created. In the 1950s, Bulova developed the Accutron, the first electronic watch, which was accurate to keeping time to within two seconds a day. During the 1960s, NASA asked the company to bring its timing expertise to computers for the Space Program. A Bulova timer was placed on the moon's Sea of Tranquility to control the transmissions of vital data through the years.  (less)