Whose calculations first explained the tipping point that keeps Mercury in a 3:2 spin-orbit resonance?
Quick Answer
Gérard de Vaucouleurs and later planetary dynamicists explained Mercury’s unusual rotation, which was confirmed by radar in the 1960s. Mercury spins three times for every two orbits around the Sun.
The Full Story
Mercury’s rotation is unusual because it is locked in a 3:2 spin-orbit resonance, not the more familiar synchronous rotation seen for the Moon. The underlying mechanics were studied by astronomers and dynamicists in the 20th century and confirmed by radar observations in the 1960s. Mercury rotates three times on its axis for every two trips around the Sun. This resonance is a striking example of how tidal forces shape planetary motion.
Key Facts
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"The weirdest day length in the Solar System"
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