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