Glossary


Browse the glossary using this index

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S

Schedule

A plan that shows when things will happen.


Second

The smallest commonly used unit of time, 60 of which make a minute.


Solar day

The time it takes for the Earth to rotate once relative to the sun (about 24 hours).


Solar year

The time it takes Earth to orbit the Sun once (about 365.25 days).


Stopwatch

A tool used to measure exact time, usually for short events like races.