1884年,国际子午线大会确立了格林威治标准时间(GMT),即伦敦附近的格林威治皇家气象台(the Royal Observatory in Greenwich)的平均太阳时间。
The International Meridien Conference of 1884 established Greenwich Mean Time, referring to the mean solar time at the Royal Observatory in Greenwich, near London.
为了使地球保持恒定的平均温度,来自地球的这种辐射必须平衡入射的太阳辐射。
For the Earth to maintain a constant average temperature, such emissions from the planet must balance incoming solar radiation.
在我们的太阳附近,星际物质的平均密度比最好的地球实验室真空还要低1000到10000倍。
The average density of interstellar material in the vicinity of our Sun is 1,000 to 10,000 times less than the best terrestrial laboratory vacuum.
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