Kepler's Second Law: Areal Velocity (dA/dt = L/(2m) = const)
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dA/dt = L/(2m) = const
What each symbol means
| Symbol | What it stands for |
|---|---|
| A | Area swept by radius vector |
| L | Angular momentum magnitude about M |
| m | Orbiting mass |
When to use this
Central gravitational force → torque about M is zero → L conserved → areal velocity constant.