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同学们都知道,地球绕着太阳转一圈,就是一年;地球同时还自转着,每自转一圈,就是一天。地球自转的速度是均匀的,不会忽然变快,也不会忽然变慢。所以,这决定了太阳每天都匀速地在我们的天空划出一道从东方升起,从西方落下的圆弧。根据这个原理,我们就可以用手掌来计时了。我们把太阳在天空中运行的弧线分为24等份,然后再举起我们的双臂:当手臂朝向东方且跟地面平行的时候,代表早上六点整,然后我们不断交叠手掌,逐渐抬高手臂,
The classmates all know that the earth turns around the sun for a year. The earth also rotates at the same time, and every rotation turns out to be a day. Earth’s rotation speed is uniform, will not suddenly become faster, it will not suddenly slow down. Therefore, it determines that the sun draws a uniform arc of sky rising from the east and falling from the west in our skies every day. According to this principle, we can use the palm to time. We divide the arc of the sun’s movement in the sky into 24 equal parts, and then raise our arms again: when the arms are orientated eastward and parallel to the ground, we represent a full 6 o’clock in the morning, and then we continue to overlap our hands and gradually Raise your arms,