El que inventó el reloj ¿Cómo sabía qué hora era?

The video explores the history of time measurement, starting with early methods by the Egyptians who used sundials to divide the day into 12 intervals. The Romans adopted this system, leading to the 24-hour day. The division of hours into 60 minutes and minutes into 60 seconds is attributed to the convenience of the number 60. Over time, mechanical clocks introduced precise timekeeping, which evolved into atomic clocks, ensuring global synchronization.

How did the Egyptians initially divide the day?

• Into 24 equal parts

• Based on the phases of the moon

• Using a decimal system

• Into periods of light and darkness

What was the main reason for the Romans adopting the 24-hour day system?

• It was easier to calculate

• It was based on the decimal system

• It was inherited from the Egyptians

• It was a requirement by law

Why is the number 12 significant in ancient timekeeping systems?

• It was the number of Roman emperors

• It was the number of Egyptian gods

• It is easily divisible by many numbers

• It is the number of months in a year

What advancement in timekeeping occurred during the Middle Ages?

• Inclusion of minutes and seconds in mechanical clocks

• Introduction of digital clocks

• Use of atomic time

• Development of the sundial

How is a second defined in modern atomic timekeeping?

• As the duration of a pendulum swing

• As a fraction of a lunar cycle

• As a fraction of a solar day

• As the time for a cesium atom to oscillate over 9 trillion times