How many times does Mercury rotate around its axis with respect to the distant stars in one orbit round the Sun? (See Figure 6-34 and Figure 6-44,Comins,Discovering the Essential Universe,6th ed.)

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Mercury rotates around its axis once for every orbit around the Sun, a phenomenon known as 3:2 spin-orbit resonance, meaning it completes 1.5 rotations per orbit, but with respect to distant stars, it rotates once.

How Many Times Does Mercury Rotate Around Its Axis with Respect