| 1. | It refers to mean solar time at the meridian of Greenwich, England.
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| 2. | The definition of the second in mean solar time, however, is unchanged.
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| 3. | In traditional astronomical usage, civil time was mean solar time reckoned from midnight.
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| 4. | This aggregates to the angular equivalent of mean solar time + 12 hours.
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| 5. | In the early 19th century, Portugal adopted mean solar time.
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| 6. | "' Mean solar time "'was originally apparent solar time corrected by the equation of time.
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| 7. | After 1884, mean solar time at Greenwich became a standard, later named Universal Time ( UT ).
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| 8. | With respect to mean solar time however, this translates into Saskatchewan effectively being on DST year round.
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| 9. | Greenwich Mean Time is the mean solar time at Greenwich, through which the meridian of zero longitude passes.
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| 10. | But eventually it became clear that three effects are involved, when measured in terms of mean solar time.
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