完美的时机！(Perfect timing!)

今天是美国实行夏令时的第一天，这意味着时钟向前移动一小时，时间变化发生在当地时间凌晨2点。在这里你可以看到法国里昂大教堂的天文钟，它建于1660年，早在20世纪白天时间被广泛采用之前。时钟交叉的指针和刻度盘不仅告诉我们时间，它们还形成了一个地球的平面模型，跟踪太阳和月球相对于地球的位置。黄道十二宫的刻度盘，抵消了这颗行星的自转倾斜，显示了目前正处于这个季节的星座。
原文：
Today is the first day of daylight saving time in the US that means the clocks move forward by one hour, with the time changes taking place at 2:00 am local time. Here you are seeing the astronomical clock at Lyon Cathedral in France that was built in 1660, long before daylight time became widely adopted in the 20th century. The clock's intersecting hands and dials don't just tell time, they form a flattened model of our planet that tracks the positions of the sun and moon relative to Earth. The zodiac dial, offset to account for the planet's rotational tilt, shows the star sign currently in season.
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