自从哥白尼于1543年提出日心说之后,估算行星和太阳间距离的比率就变得较容易了。17世纪初期,开普勒提出宇宙和谐定律,发现行星绕太阳运行的时间的平方与行星和太阳间的平均距离的立方是成比例的,这样一来,计算行星和太阳间的距离就变得更简单了。但是直到卡西尼所处的时代,人 Since the introduction of heliocentric theory by Copernicus in 1543, it has become easier to estimate the ratio of the distance between the planet and the sun. In the early 17th century, Kepler proposed the law of cosmic harmony and found that the square of the time the planets traveled around the sun was proportional to the cube of the average distance between the planet and the sun. Thus, calculating the distance between the planet and the sun became More simple. But until the time Cassini was in, people