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5000211 Day and Night Cycle
5000211晝夜更替
Hi, my friends and I are curious to know about the day and night cycle. Don’t you want to know why we have the day and night cycle? Come, join us on our trip and explore this wonder of the universe.
嘿，我和我的朋友們都很好奇想知道晝夜更替。難道你不想知道為什么我們會有晝夜更替嗎？來吧，和我們一起來探索這個神奇的宇宙吧。
Objective:
課程目標：
?We will learn that day and night cycle is a natural phenomenon that takes place on the earth.
?我們將會知道晝夜更替是地球上發生的一種自然想象。
Planets in the solar system are in constant motion and they revolve around the sun. All these planets, including the earth, also rotate on their own respective axis. This rotation results in day and night on the earth. Check this out, the world time zone map shows that it is day time on some continents, while it is night-time on the others. How does this happen? Come! Let us look at the position of the earth with reference to the sun to understand this phenomenon. The sun is in a fixed position in the solar system. The earth, as you know, constantly rotates on its own axis which is an imaginary line that runs from the North Pole to the South Pole through the centre of the earth. This rotation is from west to east and takes 24 hours to complete. Due to this rotation and positioning of the earth and the sun, it so happens that only one part of the earth can face the sun at any given time. Hence, the part that faces the sun has day, while it is night on the other side of earth that is facing away from the sun. Thus, the rotation of the earth changes day into night and night into day again. However, that part of the earth which has night-time is illuminated by the moon. But the moon does not make its own light. Just as sunlight strikes the surface of the earth, it does that of the moon as well. The moon reflects this light on to the earth during night. This explains the day and night cycle. It’s time to get back home.
太陽系中的行星是在不斷運動的，它們圍繞著太陽旋轉。所有這些行星，包括地球在內，同時也都圍繞著它們各自的軸旋轉。這種自轉的結果是導致地球出現白天和黑夜。來看看這個，世界時區地圖顯示當一些大陸是白天時，而其他大陸則是夜晚。這是如何發生的呢？快來！讓我們根據太陽查看地球的位置來理解這種現象。太陽在太陽系中的位置是固定的。地球，正如你所知道的，它不斷地圍繞著它自己的軸旋轉，這個軸是一條假想線，它通過地心并連接北極和南極。這種自轉是自西向東的，完成自轉所需要的時間是24小時。由于地球和太陽的這種旋轉和定位，在任何特定的時間內地球碰巧只有一部分是對著太陽的。因此，對著太陽的那一部分是白天，而在背對太陽的地球另一端則是黑夜。這樣，地球的自轉讓白天變為黑夜，并再次讓黑夜變為白天。盡管如此，地球有黑夜的那一部分由月球來照亮。但是月球本身是不會發光的。就像太陽光照射到地球的表面一樣，月球也是接受太陽光的照射。在夜晚，月球把該太陽光反射到地球上。這就解釋了晝夜更替。是時候該回家了。
Summary:
總結：
?Today we learnt about the day and night cycle.
?今天我們學習了晝夜更替。
?The earth revolves around the sun and is constantly spinning on its axis.
?地球圍繞著太陽旋轉的同時并繞著它自己的軸不斷地旋轉。
?It takes 24 hours to complete one rotation.
?完成一次自轉需要24小時。
?Only one part of the earth faces the sun at any given time.
?在任何特定的時間，地球只有一部分是對著太陽的。
?Thus the part of the earth facing the sun has day while the other part has night.
?因此，地球對著太陽的那一部分是白天，而地球的其他部分則是黑夜。

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