The International Meridien Conference of 1884 established Greenwich Mean Time, referring to the mean solar time at the Royal Observatory in Greenwich, near London.
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。
In this paper, some analyses have been done to the mean refraction of the wellknown refraction tables of Pulkovo Observatory (Fifth edition).
本文介绍了普尔·科沃天文台大气折射表第五版并对表列的平均折射结果进行了一些分析。
The drift of CZB-1 tiltmeter at Lanzhou Observatory is analyzed and studied in this paper. According to the drift tendency of daily mean values curve, the drift phenomena could be eliminated.
分析研究了兰州观象台czb - 1型竖直摆倾斜仪资料的漂移现象，并依据日均值曲线的漂移趋势，对日均值进行了漂移的剔除。
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