While it happens to be one of the most gorgeous events in all of Earth observable celestial happenings, we can only see Venus pass between the Earth and the face of the Sun once every 105 years. But why? It has to do with a bit of simple geometry, easily explained by the video in the link. Take a look.
http://www.abc.net.au/science/articles/2012/05/25/3510139.htm
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