里昂天文鐘 里昂天文鐘 如果夏令時的第一天沒有讓你欣喜若狂，那么這個高聳的里昂天文鐘可能會比你更快。法國里昂大教堂的里昂天文鐘建于1660年，遠遠早于20世紀白天被廣泛采用。時鐘交叉的指針和刻度盤不僅告訴我們時間，它們還形成了一個地球的平面模型，跟蹤太陽和月球相對于地球的位置。黃道十二宮的刻度盤，抵消了這顆行星的自轉傾斜，顯示了當前的星座季節(jié)。全部這個圓圈和球體的運動可能會讓人想起另一個紀念日：3月14日是π日，慶祝數(shù)學常數(shù)π（又名π，約3.14）。您還記得幾何類中的pi：它表示圓周圍的距離與穿過圓的距離之比。因此，這對繪制這些天體運行圖的古代天文學家，以及模擬環(huán)繞的復雜機器的設計者來說，都是至關重要的天哪。哇，你一直在讀數(shù)學課？你應該得到一個甜蜜的回報。為什么不加入我們的派日測驗呢？

原文:

If the first day of daylight saving time doesn't have you springing for joy, this towering timekeeper might be more your speed. The astronomical clock at Lyon Cathedral in France 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.All this movement of circles and spheres might call to mind another observance of the day: March 14 is Pi Day, in celebration of the mathematical constant pi (aka π, or roughly 3.14). You remember pi from geometry class: It expresses the ratio of the distance around a circle to the distance across it. So it was essential to ancient astronomers who mapped these celestial workings, as well as to designers of intricate machines that simulate the circling heavens.Wow, you kept reading through all the math talk? You deserve a sweet payoff. Why not slice into our Pi Day pie quiz?

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