Calendrical dating definition

15-May-2016 17:24

At the end of this web page are links to other web pages which better explain the definitions of various time scales.Many visits to this page are prompted by APIs used in computer languages that want to handle elapsed time.Reckoning time by tides is sufficiently simple that rocks can do it.

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The ellipticity of the earth's orbit and the obliquity of the earth's equator produce a variation in the duration of a day reckoned by apparent noon.

The variation is known as the "equation of time", and it is large enough that a pendulum clock is stable enough to measure it.