How Did People Measure Time Before Clocks?

Before clocks, people used the sun and stars to tell time. During the day, they watched where the sun was in the sky, when it rose, that was morning; when it set, that was night. At night, they looked at the stars, especially the moon. People even made big stones or fires to mark time! For example, if you had a fire burning all day and then it went out, that meant it was nighttime.