Equation of time | Wikipedia audio article
Channel: Subhajit Sahu
Date: 2018-12-14

This is an audio version of the Wikipedia Article:
Equation of time


00:00:58 1 The concept
00:02:47 2 Sign of the equation of time
00:03:59 3 History
00:07:31 3.1 Ancient history—Babylon and Egypt
00:08:25 3.2 Medieval and Renaissance astronomy
00:09:23 3.3 Apparent time versus local mean time
00:11:27 3.4 18th and early 19th centuries
00:14:04 4 Major components of the equation
00:14:14 4.1 Eccentricity of the Earth's orbit
00:15:51 4.2 Obliquity of the ecliptic
00:17:51 5 Secular effects
NaN:NaN:NaN 6 Graphical representation
NaN:NaN:NaN 7 Practical use
NaN:NaN:NaN 8 Calculating the equation of time
NaN:NaN:NaN 8.1 Mathematical description
NaN:NaN:NaN 8.2 Right ascension calculation
NaN:NaN:NaN 8.3 Equation of time
NaN:NaN:NaN 8.3.1 Remark on the continuity of the equation of time
NaN:NaN:NaN 8.4 Secular effects
NaN:NaN:NaN 8.5 Alternative calculation
NaN:NaN:NaN 8.5.1 Addendum about solar declination
NaN:NaN:NaN 9 See also
NaN:NaN:NaN 10 Notes and footnotes
NaN:NaN:NaN 11 References
NaN:NaN:NaN 12 External links
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SUMMARY
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The equation of time describes the discrepancy between two kinds of solar time. The word equation is used in the medieval sense of "reconcile a difference". The two times that differ are the apparent solar time, which directly tracks the diurnal motion of the Sun, and mean solar time, which tracks a theoretical mean Sun with noons 24 hours apart. Apparent solar time can be obtained by measurement of the current position (hour angle) of the Sun, as indicated (with limited accuracy) by a sundial. Mean solar time, for the same place, would be the time indicated by a steady clock set so that over the year its differences from apparent solar time would resolve to zero.The equation of time is the east or west component of the analemma, a curve representing the angular offset of the Sun from its mean position on the celestial sphere as viewed from Earth. The equation of time values for each day of the year, compiled by astronomical observatories, were widely listed in almanacs and ephemerides.