If you ever asked yourself why we celebrate Christmas in December (and some in January), I am suggesting that you take a strong cinnamon tea with lemon or orange flavour, get an armchair and read this wise article from Andrew McGowan. It is quite inspiring and has a lot of interesting facts from the past: http://www.biblicalarchaeology.org/daily/biblical-topics/new-testament/how-december-25-became-christmas. 
13/12/2013 at 12:44
Thanks for this link and the reminder of the connection between the birth and death of Jesus.
14/12/2013 at 00:04
This article may also be of interest. It is shorter and focuses on key points. http://www.prescottorthodox.org/2011/12/calculating-christmas/
15/12/2013 at 09:12
Thank you Michael.