- Calendar: is a systematic account of the time for the organization of human activities allows us to have an accurate measure of year months and days. - Clock: is a tool that allows us to measure the passage of time in years, hours, minutes and seconds . There are variety of watches such as sun, sand clock, analog, digital and more. - Timer: is an instrument used to measure fractions of time, usually short and accurately seconds, milliseconds, etc. .. 
- Atomic Clock: a clock whose operation is based on the frequency of atomic vibration . is a kind of clock that uses an atomic resonance frequency normal to feed its counter. • - Radiometric Dating : is the technical procedure used to determine the absolute age of rocks , minerals and organic debris. Letting you know the exact age of minerals to 60,000 years.
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