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12! The Western calendars have settled into 12 months in a year for several thousand years.
Calendars are based on astronomy: the cycle of the moon and the seasons.
No. Many calendars were in use before this.
February, April, June, September and November. But that is only in the Gregorian calendar. There are many other calendars.
12 months in a year.JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecemberThere are twelve months in a year in the gregorian calendarOther calendars have different numbers, for example Jewish calendar has 12 or 13 months in a year, and the original roman one had 10 months.
The inca had 100 calendars.
There are 12 months of the year using the Gregorian calendar and they are: January February March April May June July August September November December There are many other calendars and each have different numbers of months and use different names
The Olmecs used 3 calendars.
You can buy Dog and Puppy calendars from Calendar Factory. The have many types of calendars, but they specialize in Dog calendars. Their website is at the link below.
Four months
they had 90000000000000000 billion calendars minus 123151671237234 squared.