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Time and duration,
in proportion.
Compare intervals from particle processes to human activities, geological history and cosmic ages.
Time records may be exact defined intervals, measured lifetimes or rounded historical models. The illustration identifies the subject rather than depicting a physical length.
- Entities
- 22
- Most common primary scale
- Time
- Common measurements
- Time, Frame interval, Representative mean lifetime, Orbital period, Mean synodic month, Mean lifetime
Within this category's most common primary scale, explore Planck time at 5.391 × 10⁻⁴⁴ s and Age of the universe at 13.8 Gyr. These are navigation anchors, not universal category limits.
22 entities in this category, ordered by name.
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22 measured entities
Browse time and duration
A century100 yearsA century is a period of one hundred years.A feature film2 hA feature film is a motion picture created to tell a complete story for viewers.A song3.5 minA song is a musical composition intended to be performed vocally or instrumentally.A workday8 hA workday is a typical period during which people perform paid employment.
Age of Earth4.54 GyrThe age of Earth is the time that has passed since the planet formed from the solar nebula.Age of the universe13.8 GyrThe age of the universe is the time since the Big Bang, marking the beginning of cosmic expansion.Atomic-scale transition1 fsAn atomic-scale transition is a rapid change in the energy state of an atom, often occurring in extremely short intervals.Blink of an eye150 msA blink of an eye is the quick closing and opening of the eyelid, usually happening involuntarily.Camera flash1 msA camera flash is a brief, intense burst of light used to illuminate a scene for photography.
Cinema frame at 24 frames per second41.67 msA cinema frame at 24 frames per second is the time interval between consecutive images in standard film projection.
Free neutron mean lifetime14.67 minFree neutron mean lifetime is the average time a neutron exists outside an atomic nucleus before decaying into other particles.Geostationary satellite orbit23.93 hA geostationary satellite orbit is a circular path above Earth's equator where a satellite moves at the same rate as Earth's rotation, appearing stationary over one longitude.Heartbeat1 sA heartbeat is the regular contraction of the heart that pumps blood through the body.Human lifetime80 yearsA human lifetime is the span from a person's birth to their death.Moon 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.Muon lifetime2.197 µsMuon lifetime is the average time a free muon exists before decaying into other particles, such as an electron and neutrinos.Planck time5.391 × 10⁻⁴⁴ sPlanck time is the theoretical shortest meaningful interval of time, defined using fundamental physical constants.Recorded-history interval5 kyrThe recorded-history interval is the span for which humans have kept written or documented records.Saturn rotation period10.7 hSaturn's rotation period is the time the planet takes to complete one full turn relative to distant stars, defining its day.Since the non-avian dinosaurs66 MyrThe interval since the non-avian dinosaurs marks the time since these dinosaurs disappeared from Earth.Top quark lifetime5 × 10⁻²⁵ sThis is the average time a top quark exists before it decays into other particles.Venus 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.