Measurement Of Time Flashcards
Why is measuring time necessary in daily life?
It helps us do various things on time, such as waking up, getting ready, and reaching school.
How did people in ancient times measure the passage of time?
By observing repetitive natural events like sunrise, sunset, phases of the moon, change of seasons, and migration of birds.
What is the study of time-measuring devices called?
Horology.
What is a sundial?
A device used in ancient times to tell time during the day using a circular plate with time divisions and a gnomon.
What is the function of the gnomon in a sundial?
It casts a shadow on the dial to indicate the time.
What are the limitations of using a sundial?
It cannot be used at night or on cloudy days.
What is a water clock?
A time-measuring device that uses the regulated flow of water into or out of a vessel.
Who invented the water clock?
The ancient Greeks.
What is a drawback of water clocks?
They require regular monitoring as the rate of flow varies with temperature.
What is a sand clock also known as?
An hourglass.
How does a sand clock measure time?
By allowing sand to flow in a regulated manner from one bulb to another.
What intervals of time are typically measured by a sand clock?
Small intervals such as minutes and sometimes hours.
Fill in the blank: The period of time between one sunset and the following sunrise is considered one _______.
night.
True or False: Sundials can be used at night.
False.
What are some examples of natural events used to estimate time in ancient times?
- Sunrise
- Sunset
- Phases of the moon
- Change of seasons
- Migration of birds
