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solar time 太陽時。

solar wind

Greenwich mean time ( gmt ) is mean solar time at the royal greenwich observatory in greenwich , london , england , which by convention is at 0 degrees geographic longitude 格林尼治國際標準以英國倫敦格林威治皇家天文臺為準,也就是零經度為準。

Us scientists want to change the current system , which keeps clocks in synch with solar time by adding a leap second every 18 months or so 美國科學家希望改變現行系統,亦即透過每隔約18個月添增1閏秒,讓時鐘與太陽時保持一致。