Which Kepler's Law describes the mathematical relationship where the square of a planet's period ($T$) is proportional to the cube of the semi-major axis ($a$)?
Answer
The Law of Periods
The Law of Periods, Kepler's third law, establishes the proportionality $T^2 \propto a^3$, relating the time it takes for an object to complete an orbit to the size of that orbit's semi-major axis.
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