| 31. | The sundial's indicated solar time thus varies from clock time by small amounts that change throughout the year.
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| 32. | Greenwich Mean Time is the mean solar time at Greenwich, through which the meridian of zero longitude passes.
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| 33. | :: The " equation of time " represents the difference between local mean time and local solar time.
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| 34. | The east west component shows the equation of time, or the difference between solar time and local mean time.
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| 35. | Standardization has disconnected our clocks and our lives from strict local solar time as a sundial might measure it.
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| 36. | Of course, the equation of time can still be used, when required, to obtain apparent solar time from clock time.
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| 37. | Solar timing is based on insolation in which the solstices and equinoxes are seen as the midpoints of the seasons.
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| 38. | Mean solar time has days of equal length, and the difference between the two sums to zero after a year.
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| 39. | In this way, decisions made by the original designers of ephemeris time influenced the length of today's mean solar time.
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| 40. | Two types of solar time are apparent solar time ( sundial time ) and mean solar time ( clock time ).
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