Kepler’s Laws

Core Sentence / 核心句

Kepler’s laws describe elliptical orbits, equal areas in equal times, and the period-size relation $T^2\propto a^3$.
$\frac{dA}{dt}=\frac{L}{2m},T^2=\frac{4{\pi }^2}{GM}{a}^3$

Watch Out / 易错点

椭圆使用 semi-major axis $a$；equal-area law 是 angular-momentum conservation 的几何表达。

Mentioned In / 出现位置

• 第11次正课 · Kepler

Connected Notes / 连接

• Orbital Motion
• Conservation of Angular Momentum