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           | Description | 
           Diagram showing how Mercury's orbital period and rotational period are locked in a 3:2 resonance. | 
          
          
           | Date | 
           5 February 2008 | 
          
          
           | Source | 
            http://en.wikipedia.org/wiki/Image:Mercury%27s_orbital_resonance.png | 
          
          
           | Author | 
           Tos, converted to SVG from PNG. Original author: Worldtraveller | 
          
         
         
        
         
          
            Tos at the  English language Wikipedia, the copyright holder of this work, hereby publishes it under the following license:
           
            
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             Permission is granted to copy, distribute and/or modify this document under the terms of the  GNU Free Documentation License, Version 1.2 or any later version published by the  Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled  GNU Free Documentation License.  http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue 
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