| 21. | The equation of time is constant only for a planet with zero axial tilt and zero orbital eccentricity.
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| 22. | :: The " equation of time " represents the difference between local mean time and local solar time.
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| 23. | As explained in the equation of time article, this is due to the obliquity of the ecliptic ).
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| 24. | This correction which may be as great as 15 minutes is described by the equation of time.
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| 25. | The east west component shows the equation of time, or the difference between solar time and local mean time.
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| 26. | The excess half turns are removed in the next step of the calculation to give the equation of time:
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| 27. | To lazy to dive into this subtlty I decided that the Equation of Time article explains this well enough.
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| 28. | This correcting value is given in tables and known as Equation of time ( see there for details ).
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| 29. | These usually have hour lines shaped like " figure eights " ( analemmas ) according to the equation of time.
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| 30. | Machines such as solar trackers and heliostats have to move in ways that are influenced by the equation of time.
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