The usefulness of iron had been known for centuries however, it was difficult to produce because ovens had to be constantly heated, something the steam engine could do.
I think its around 5,000 - 6,000 BC
Answer:
they had 12
Explanation:
The ritual, central Inca calendar, adapted to the ecological, cultural, and ethnic realities of the Cuzco valley, was the basis of the imperial calendar, used for the administration of the Inca Empire. According to the main historical sources, it was composed of 12 synodic months calculated from new moon to new moon.
A church council maybe about 400AD - the same one that decided to suppress the role and importance of Women in the Church... Hope this helps! :)