T (period): —
r_min (perihelion): —
r_max (aphelion): —
v (velocity): —
Law II: A=const ✓
KEPLER'S THREE LAWS
I: Orbits are ellipses with the star at one focus.
II: Equal areas swept in equal times (angular momentum).
III: T² ∝ a³ — period scales with semi-major axis.
Vis-viva: v² = GM(2/r − 1/a)