The correct spelling is calendar (list or diagram by days, weeks, months, or years).
The similar word is colander, a type of kitchen strainer.
Yes the US calandar will continue. The Mayan calandar will start over though. We will not.
If you mean the calandar that contains January February etc, it is the Gregorian Calandar, named after Pope Gregory XIII.
Normaly with a advent calandar
2013 our calandar will keep going on the mayans calandar will end so they might start over but we will not.
It was reform of the Julian calendar.
Julian
The 13th sign is "Ophiuchi". Nothing special about it, it just got dropped when people went from a 13 Moonth calandar to a 12 month calandar about 2000 years ago (blame the Romans).
From very precise calculations of vernal equinoxes.
I found a calandar on wiki for what will be played on what day, link is below.
Calandar The calendar was made by the Aztec's. Sincerely, iblog
The fifth century A.D (or C.E.) is from the years 401 to 500 on the Gregorian calandar.
There's a calandar icon in the top right coner of the in-game screen.