History of the measurement of time
por Zac W
1. Time measuring devices
1.1. Sundial
1.2. quartz watch
1.3. chronometer
1.4. digital watch
2. Physical definition
2.1. Classical mechanics
2.2. modern physics
2.3. spacetime
2.4. time dilation
2.5. arrow of time
3. Use of time
3.1. sociology
3.1.1. time discipline