Solar Orbit

太阳轨道

行星数据

Note: The orbit radii in this table are from the NASA Solar System Data Table.

注意：本表中的轨道半径来自NASA太阳系数据表。

Accurate values for the periods of the planets can be calculated from Kepler's Law of Periods and the semimajor axes of the elliptical orbits. But it may be instructive to calculate approximate values for the periods and orbital velocities assuming a circular orbit at the average orbital radius.

行星轨道周期的准确值可以根据开普勒周期定律和椭圆轨道的半长轴计算出来。但假设在平均轨道半径处进行圆周运动，计算周期和轨道速度的近似值可能具有教育意义。

Note that the accurate length of the Earth year is 365.256 days, so approximating the Earth's orbit with a circle gives an error of about 2 days or about 0.6%, so the Earth's orbit is very close to being a circle. The departure from circular orbit for the planets can be expressed in terms of the eccentricity of the orbits.

注意，地球年的确切长度是365.256天，因此将地球轨道近似为圆会产生约2天或约0.6%的误差，因此地球轨道非常接近于圆形。行星轨道偏离圆形的程度可以用轨道的偏心率来表示。

These approximations make use of Newton's second law, the law of universal gravitation and the concept of centripetal force. A perfectly circular orbit can be precisely described as follows:

这些近似方法利用了牛顿第二定律、万有引力定律和向心力的概念。一个完美的圆周轨道可以精确地描述如下：

T = 地年。轨道速度 v_orbit = km/hr，v_orbit = mi/hr

中文译文中的待填/计算数值依次对应：1：tpy 2：vk 3：vc。实际数值以上方原输入框为准。

Index

Gravity concepts

Orbit concepts

索引重力概念轨道概念

HyperPhysics***** Mechanics ***** Rotation

HyperPhysics ***** 力学 ***** 转动

R Nave

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