Guide Note

Time is a system of measurement that is used to help determine the position and duration of events along a linear frame of reference. Humans have used a variety of instruments and methods to measure time throughout history.

Fast Facts

1. The length of a second is determined by the speed of radiation from a Caesium 133 atom¹
2. Time is one of the Fundamental Units in Physics²
3. Greenwich Mean Time is the time it takes the earth to rotate from noon-to-noon and is calculated from the Royal Observatory in Greenwich, England³

"The only reason for time is so that everything doesn't happen at once." —Albert Einstein⁴

"Time is an illusion. Lunchtime doubly so." —Douglas Adams⁵

"This time, like all times, is a very good one, if we but know what to do with it." —Ralph Waldo Emerson⁵

• Millisecond: 0.001 Seconds
• Second: Base unit of measurement
• Minute: 60 Seconds
• Hour: 60 Minutes
• Day: 24 Hours
• Week: 7 Days
• Month: 28-31 Days
• Year: 12 Months
• Decade: 10 Yeas
• Century: 100 Years
• Millennium: 1,000 Years