The Days of the Week

Another product of my non-productive curiosity is the reason for the names of the days of the week. I mean I can understand that Sunday is probably Sun's day and Monday is probably Moon's day as is Saturday Saturn's day. But, where do Tuesday, Wednesday, Thursday and Friday come from?
All these four days are named of the Germanic Gods. Thanks to the recent spate of myth-based movies, people seem rather familiar with Thor and Loki at least. Well! Tuesday is named after Tiu (or Tyr) the Germanic God of war. Wednesday is Woden's day (Woden is Odin) named after the Germanic king of Gods. Thor is, of course, the God for whom Thursday - Thor's day - is named. Friday is Freya's day - the Venus-equivalent in Germanic lore.
There is almost identity in the planets after which the days are named in India as well. Sunday is named after the Sun; Monday after the moon and Tuesday is based on Mars in India as well - as is Friday named after Venus and Saturday after Saturn. The Germanic lore differentiates between the King of Gods (Odin) and the Thunderer (Thor) - so, it could be assumed that Woden is Mercury and Thor is Jupiter which would be identical to Indian names for those days. At best, these two days have been inter-changed.
By the way, I knew of all this even when the Internet was not even a blip on the horizon so I owe nothing to Google for this information. In fact, there is a whole lot of interesting words for which the roots are in myth, which I explored in an earlier post - Etymology and Mythology.
For example why is January January or May May? That, as school teachers are wont to say, is beyond the scope of the current syllabus!
I am taking part in The Write Tribe Festival of Words 1st - 7th September 2013