ELI5: Explain Like I'm 5

Chronometry

Chronometry is the science of measuring time. We measure time with things like clocks and watches. Clocks and watches measure the amount of time that has passed since a certain point. For example, they might measure how many seconds, minutes, or hours have passed since a certain hour or day. Clocks and watches help us figure out when it's time to do things like go to school, get up in the morning, or go to bed at night. So chronometry helps us keep track of time and stay organized.