Lia:ISS - Timekeeping
Storyboard Text
- Sundials
- Using the placement of the shadows, people could tell the hour of the day.
- We can tell the time by using the shadows
- I can tell that it is close to noon from the way the shadows are pointing!
- First Mechanical Clocks
- I can finally tell time accurately with this
- The first mechanical clock was inspired by the sundial to track the time using pouring water and a clock without many gears.
- Mechanical Alarm Clocks
- I can set the alarm to go off for any time of the day.
- The first mechanical alarm clock could only ring at 4 in the morning. But almost a century later, a new one was made that could ring for any set time.
- - In early times, people used shadows to tell the time.- Also in earlier times, they created a sundial to better tell time.- They used a method of liquid to tell time if the sun was blocked.- They could also keep track of the date using moon phases.- Sundials were used all over the world.
- - Ptolemy created time zones to help astronomers studying the sky.- Drumbeats and water were used to track the time in the first mechanical clock.- The sundial helped in the creation of the first mechanical clock to make the clock better and more accurate in timekeeping.
- - Alarm clocks were based off of the first mechanical clock but you could make it ring at a certain time.- The first mechanical alarm clock could only ring at 4:00 a.m. in 1787.- In 1876 a new mechanical alarm clock was made based offf of the first one. This one could be set to ring at any time.
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