Brooke Clarke wrote:

> It turns out that the Wikipedia web page:  
> http://en.wikipedia.org/wiki/Zeller's_congruence
> has a typo in the equation.  It shows the Month term to be 26*(M+1)/10 
> which is equivalent to 13*(M+1)/5 <- WRONG!
> 
> The web pages about Zeller at:  
> http://www.merlyn.demon.co.uk/zeller-c.htm#OIW
> Under the title "Other Implementations for Day-of-Week" gives a concise 
> explanation of Zeller's method.  Note the month term is:  (13*M-1)/5.
> The problem is with the parenthesis.  

Good catch... Maybe consider adding a comment to the Wikipedia page? Helps 
others who come later :)

Thanks for the follow-up,
Gerhard

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