The Maya - they invented it.
there are nine types of calendars used in India
The Olmecs used 3 calendars.
they were used at first for colecting early and the kings added days to rule longer
They used astronomy and the sun dial to make accurate yearly calendars
Because Sunday is the first day of the week, and not Monday as some people think.Following the Dark Ages, secular publishers of calendars adopted the form used by the church and monasteries.(See the related question below.)Many calendars begin with Sunday because may people treat Sunday as the first day of the week. Monday, is just the first day of the working week.However, some people follow the Biblical implication that, as the Christian Sabbath, Sunday was the last day of the week, for them some calendars begin with Monday.
Zapotec
mayans
Olmec and Mayan
One of the first advanced calendars
The first known calendar is believed to have been created by the ancient Sumerians around 4000 BCE. It was a lunar calendar based on the phases of the moon. This system later influenced the development of other calendars used by various civilizations.
System of Calendars *1) LuniSolar Calendars *2) Lunar Calendars *3) Solar Calendars List of Calendars *1) Anno Domini Christian Era *2) Aztec Calendar *3) Babylonian Calendar *4) Bah
bang bang