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We have a webpage that changes content each evening at mid-night -- let's call this page URL /foo.  This allows a user to bookmark URL /foo and obtain new content each day.  In our case, the content on URL /foo for a given day is the same content that exists on another URL on our website.  Let's say the content for November 5th is URL /nov05, November 6th is /nov06 and so on.  This means on November 5th, there are two pages on the website that have almost identical content -- namely /foo and /nov05.  This is likely a duplication of content violation in the view of some search engines. Is the Canonical URL Tag designed to be used in this situation?  The page /nov05 is the permanent page containing the content for the day on the website.  This means page /nov05 should have a Canonical Tag that points to itself and /foo should have a Canonical Tag that points to /nov05.  Correct? Now here is my problem.  The page at URL /foo is the fourth highest page authority on our 2,000+ page website.  URL /foo is a key part of the marketing strategy for the website.  It has the second largest number of External Links second only to our home page.   I must tell you that I'm concerned about using a Cononical URL Tag that points away from the URL /foo to a permanent page on the website like /nov05.  I can think of a lot of things negative things that could happen to the rankings of the page by making a change like this and I am not sure what we would gain.  Right now /foo has a Canonical URL Tag that points to itself.  Does anyone believe we should change this?  If so, to what and why? Thanks for helping me think this through!  Greg