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经过多年的对大量经验数据的研究,德国天文学家约翰尼斯·开普勒创立了描述太阳系行星运动规律的三大定律.其中第一大定律表明太阳系行星的运动轨道是以太阳为一焦点的椭圆.这些椭圆的离心率与0很接近,因此近似于一个圆.拿地球来说,其离心率e=0.017,火星的离心率e=0.093.天王星的离心率e=0.046.水星与冥王星的轨道相对稍扁一点,其离心率分别为0.206和0.249.
After years of research on a large amount of empirical data, the German astronomer Johannes Kepler founded the three laws that describe the laws of the movement of the solar system’s planets. The first law states that the orbits of the solar system’s planets are sun-focused ellipses. The eccentricity of these ellipses is very close to 0, so it approximates a circle. For Earth, its eccentricity is e=0.017, Mars’s eccentricity is e.093, and Uranus’s eccentricity is e=0.046. The orbit of Mercury and Pluto. Relatively slightly flat, the eccentricity was 0.206 and 0.249 respectively.