SP-423 Atlas of Mercury

Figure 3. mercury rotates on its axis three times while it circles the Sun twice.

 

Figure 3. mercury rotates on its axis three times while it circles the Sun twice. This synchronous rotation can be followed in the schematic diagram by observing the position of the dot (which represents a fixed point on Mercury's surface) as the planet moves from position 1 to 2, 2 to 3,....., 25 to 1.
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