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从日晷、便携式日晷再到钟表,日晷上能够产生阴影的针后来演变成钟表的时针。最初的钟表就只有一根针,随着人们的需要才逐渐发展出分针,秒针,即现代规范的表。钟表匠人完成了对时间的解读绝不会停滞不前,他们开始为钟表增加新的任务。时、分、秒以外,首先被考虑的新功能就是显示日期,这样人们便不用每天凝望着不会动的印刷品日历了。
From sundials, portable sundials to timepieces, the needles that produce shadows on sundials evolved into hour hands of timepieces. The first watch has only one needle, as people need it to gradually develop a minute hand, the second hand, that is, a table of modern norms. Watchmaker completed the interpretation of time will never be stagnant, they began to add new tasks for the watch. Outside the hours, minutes and seconds, the first new feature to consider is the display of dates, so that people do not have to gaze at print prints that do not move daily.