有史以来,“时间”的重要性日益增长,对其精度的要求也越来越高。起初以地球自转作为计算秒的基准就够了。后来建立了精确测量时间基准的确切定义。根据地球绕太阳旋转计算出的“里历表——秒”制成能调整到石英固有振荡频率的石英钟,人们用它在三十年代发现天体时间的波动。 Historically, “time” has grown in importance and has become increasingly demanding on its accuracy. At first, it was enough to use the Earth’s rotation as a basis for calculating the second. The exact definition of an accurate measurement time base was then established. According to the Earth’s rotation around the sun calculated “calendar - seconds ” quartz quartz clock can be adjusted to the quartz natural frequency of oscillation, people use it in the thirties to discover fluctuations in celestial bodies.