I'm not positive on this one, but I think it was the Mayan Calendar, which is a circle with a face in the center. The year was 3372 B.C.
The mayans created it 2000 years before any type of Christianity was created,
They also understood aerodynamics "MAD"
(Hardskiaroonas)
Obid created the 365 calendar
The calendar was technically first invented by the Ancient Egyptians.
The incans
The Julian calendar took effect for the first time in 45 B.C.
The first person was human.
The Jewish calendar came first. It was created in 3760 B.C. while the Mayan calendar was created in 3372 B.C.
napolean
The Mayans
shang
the mayans created the first calendar
Obid created the 365 calendar
The Newgate Calendar was created in 1774.
Positivist calendar was created in 1849.
Darian calendar was created in 1985.
Kingfisher Calendar was created in 2003.
The Calendar of Nature was created in 1821.
Pirelli Calendar was created in 1964.