| 11. | Mean solar time has days of equal length, and the difference between the two sums to zero after a year.
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| 12. | 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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| 13. | Two types of solar time are apparent solar time ( sundial time ) and mean solar time ( clock time ).
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| 14. | Leap seconds are inserted periodically to keep UTC close to Earth's angular position relative to the Sun; see mean solar time.
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| 15. | When well-regulated mechanical clocks became widespread in the early 19th century, each city began to use some local mean solar time.
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| 16. | This ideal mean solar time has been used ever since then to describe the motions of the planets, Moon, and Sun.
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| 17. | The clock time in this zone is based on mean solar time at the 135th meridian west of the Greenwich Observatory.
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| 18. | The westernmost point in Norway proper is on 4?92 E longitude, meaning 42 minutes difference between mean solar time and official time.
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| 19. | De Sitter offered a correction to be applied to the mean solar time given by the Earth's rotation to get uniform time.
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| 20. | The easternmost point in Norway proper is on 31?02 E longitude, meaning 64 minutes difference between mean solar time and official time.
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