I have a quest that I need to wait until frobble for. When the twilbot is high, at the stroke of fnirfnagle, we can begin.
lol
That sounds like something from one of the old Zork games from Infocom.
Purely a literary convenience.
We can assume that maybe Tamriel is a parallel Earth, with some similarities, i.e. a similar calendar, similar cultures (Empire=Romans, Bretons=British, Nords=Vikings), similar terrain, But with fantastical extras like cat and lizard people, orcs, magic, dragons, etc.
Bingo.
Tough to say. There are arguments either way for both French and British, based on names. I tend to think of them as related to pre-Saxon Britons, but there are certainly arguments for French influence. I expect somebody actually from France could tell you what part of the country the names mostly come from, and hence which of the older pre-French nationalities the Tamrielian Bretons most emulate.
Because someone has to think this stuff up and it`s not easy figuring out an entire years worth (including possible leap year`s) amount of realistic fantasy days and months without something screwing up.
Yup. I think even Tolkien's calendar for Middle Earth matched the Gregorian calendar, with (I think) names for the months and the days of the week created in Sindarin, Quendi and (probably) Numenorian.
I know right and why is the sky blue
Because even in Tamriel, God loves the infantry.

OT: I read a suggestion to change the real life calendar to 13 months of 28 days each, with an extra week added every 5 or 6 years. That way all months start on the same day of the week.
Heard about that - and it would be absurd. Also, historically, never trust anybody that starts making major changes to the calendar that aren't related to accuracy. Caesar Augustus named months after Julius Caesar (July) and himself (August) and the French Revolutionaries created a new calendar for no practical reason other than social engineering.
Imperials are "Roman", though the more common term (and considering the actual Roman Empire's history by the end of the empire, when it's population was hardly Roman), would be Latin.
Bretons = Angevin or Norman. That encompasses both Britain and France, though it's entirely possible some of the influences stretch as far back as the empire of Charlemagne.
http://en.wikipedia.org/wiki/House_of_Ch%C3%A2teaudun
http://en.wikipedia.org/wiki/Carolingian_Empire
Nords = Scandinavian, though I do wonder if there are some Briton (Welsh) influences too.
Elven names I find to be made of mostly fantasy, though I suspect there are some broad European influences throughout.
as for Nirn as a parallel of earth, this is close. There's an actual comparison that finds Nirn to be smaller than Earth, in between the size of earth's moon and the earth itself.
What did they base their estimate of the size of Nirn on?
I think its best to leave real world cultures out of it. No single race come to a 1:1 comparison with any other culture on earth. Nirn iteself isn't bound to the same laws of nature as our world is. The Sun itself is litterally a giant whole in the sky where magicka seeps in from realm of Magnus, as are all the stars in the sky. Not a giant ball of gass that warms the planet.
There's no reason why both can't be true. For one thing, what shape is a "hole in the sky" anyway? A circle? Or a sphere? The geometry of space is a strange thing, and if space is four-dimensional, a hole in it would be a three-dimensional hole, just as a hole in the surface of a hollow three-dimensional sphere is a two-dimensional hole.
And yes, all four of the human races of Tamriel are very clearly based on Earth cultures, although with the Bretons it seems to be a mix of Briton and some French sub-nationality.
http://www.uesp.net/wiki/Lore:Pocket_Guide_to_the_Empire,_1st_Edition/Cyrodiil
Still doesn't mean the Imperials aren't based at all on the Romans. Certainly their names show a clear Latin influence, and the military uniforms in Skyrim show it as well.