A century
A century is a period of one hundred years.
How big is it?
100 years
Time · reference interval
A little perspective
About 1.25 times the time of Human lifetime.
Human lifetime: A human lifetime is the span from a person's birth to their death.
Measurements, assumptions & sources +
A century
One hundred Julian years for consistent conversion.
Defined examples — our methodology
The marked time is calibrated. Unmeasured illustration details are representative.
Human lifetime
An 80-year comparison interval, not a prediction of life expectancy.
Defined examples — our methodology
The marked time is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 100 years
For comparison, this page uses time. This is labelled reference interval: an explicit comparison model rather than a claim that every example has the same value.
One hundred Julian years for consistent conversion.
The identifying illustration and the numerical comparison remain separate. How calibrated comparisons work →
Recorded properties
A century dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 100 years | Not recorded | reference interval |
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Sources and method
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Follow your curiosity.
TimeBlink of an eye150 msA blink of an eye is the quick closing and opening of the eyelid, usually happening involuntarily.TimeHuman lifetime80 yearsA human lifetime is the span from a person's birth to their death.
TimeAge of Earth4.54 GyrThe age of Earth is the time that has passed since the planet formed from the solar nebula.TimeAge of the universe13.8 GyrThe age of the universe is the time since the Big Bang, marking the beginning of cosmic expansion.TimeRecorded-history interval5 kyrThe recorded-history interval is the span for which humans have kept written or documented records.
PeopleRed-cell lifespan120 daysRed-cell lifespan is the average time a human red blood cell remains in circulation before being removed from the bloodstream.
TimeVenus solar day116.8 daysA Venus solar day is the interval between two successive sunrises at the same location on Venus, which is much longer than an Earth day.TimeMoon phase synodic cycle29.53 daysThe Moon phase synodic cycle is the average time between identical lunar phases, such as from one full moon to the next.