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Year Definitions: From Astronomical Cycles to Calendar Systems At its most basic level, a year is a unit of time defined by the duration it takes for the Earth to complete one orbit aroun...
Read Year Definitions: From Astronomical Cycles to Calendar SystemsUniversal Time: From Solar Observations to Atomic Precision For most of human history, time was a local affair. Every town and municipality set its clocks based on the position of the sun...
Read Universal Time: From Solar Observations to Atomic PrecisionCivil Time: From Ancient Solar Observations to Atomic Precision Timekeeping has evolved from simple observations of the sun to the hyper-precise measurements of atomic physics. Today, civ...
Read Civil Time: From Ancient Solar Observations to Atomic Precision