一 準確時間是怎样來的? 在没有鐘錶的時代,人們的勞動時間,都以太陽為標準,“日出而作,日入而息”。發明鐘錶以後人們可以依靠鐘錶來决定工作的時間,比觀察太陽精確和方便得多了。但是鐘錶有快慢,快慢的程度,也不是個個一樣的;我們怎樣才能够得到準確的時間來校正鐘錶呢?準確的時間,是要根據天體[註一]運行的觀測來確定的。我們 How does an accurate time come? In the absence of watches, people’s labor time is based on the sun, “Sunrise and make ends meet.” After the invention of the clock, people can rely on the clock to determine the working time, which is much more accurate and convenient than observing the sun. But how fast or slow the watch is, is not the same; how can we get accurate time to correct the watch? The exact time is determined by observations of the celestial body’s operation. we