Third, you'll need an astronomical calendar. The movement of celestial bodies is more accurate than a Swiss watch. Available on the market are astronomical calendars listing a given year's astronomical phenomena-the times and positions of heavenly bodies as they rise over the horizon, stellar magnitudes, as well as the schedules of comets, meteor showers, solar and lunar eclipses and other remarkable sights.
第三，以人類短暫的時間尺度來看，天體運行比瑞士鐘錶還準確，因此市面上可以買到通用的天文年曆，全年天象盡在其中，行星每天的出沒時間、位置、星等亮度，與彗星、流星雨、日食、月食等難得天象，鉅細靡遺，讓您一手掌握天文大事。