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Article: time
- Article from:
- The Columbia Encyclopedia, Sixth Edition
CopyrightThe Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press. (Hide copyright information)
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time sequential arrangement of all events, or the interval between two events in such a sequence. The concept of time may be discussed on several different levels: physical, psychological, philosophical and scientific, and biological.
Physical Time and Its Measurement
The accurate measurement of time by establishing accurate time standards poses difficult technological problems. In prehistory, humans recognized the alternation of day and night, the phases of the moon, and the succession of the seasons; from these cycles, they developed the day, month, and year as the corresponding units of time. With the development of primitive
clocks
and systematic astronomical observations, the ...
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... ... However, it is not simply 24 hours, or one mean solar day. The mean solar day is equal to the average time interval between ... mean solar second is defined as 1/86 400 of a mean solar day. However, in terms of the second of the International ...
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