The history of keeping time - Karen Mensing

TL;DR

The history of timekeeping, from sundials to atomic clocks, and how it impacts our daily lives and global communication.

Transcript

We check the time every day, all day long. But did you ever wonder - where did telling time come from? Why does it matter what time it is? Who determined the clock and why in the world are there so many different time zones? The first form of telling time was the sundial and the earliest sundials known from the archaeological record are obelisks fr... Read More

Key Insights

• 🦾 The sundial, hourglass, and mechanical clocks were significant milestones in the development of timekeeping devices.
• 🛟 Timekeeping systems are crucial in various aspects of life, such as farming, communication, and transportation, like the American railroad system.
• ⌛ The use of time zones helps standardize time and enables smoother global communication.

Questions & Answers

Q: What was the first device used for timekeeping?

The first device used for timekeeping was the sundial, which had a gnomon that cast a shadow onto a surface to indicate the time.

Q: How did hourglasses work?

Hourglasses used fine sand pouring through a hole at a constant rate to measure a predetermined period of time.

Q: What was the significance of mechanical clocks?

Mechanical clocks, invented in the 13th century, relied on pendulum swings or quartz crystal vibrations for higher accuracy than earlier time-measuring devices like sand or candles.

Q: What is the basis for scientific time today?

The basis for scientific time today is the international atomic time, which relies on the continuous count of seconds based on atomic clocks worldwide.

Summary & Key Takeaways

• The first form of telling time was the sundial, which cast a shadow onto a surface with the help of a stick called a gnomon.

• Other devices, such as hourglasses, candles, and incense sticks, were also used to estimate the passage of time.

• The invention of mechanical clocks and the modern reliance on atomic clocks have revolutionized timekeeping with greater accuracy and standardization.