Now in order to explain the motion of Venus in the sky, it's a bit more of a problem, you see Venus as we know now is closer to the sun that the earth is.
接下来想要解释，金星在天空中的运动就比较麻烦了，据我们所知相比其地球来说，金星离太阳更近。
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Astronauts look weightless because they are in continuous freefall towards the Earth, staying aloft because of their horizontal motion.
this made it eventually possible to assume that the motion of the moon and the fall of a body on earth could be governed by the same law of gravitation.