Question

The Sumerian calendar based on_days in a week.
a) Five b) Seven c)Ten d) Nine

TNSCERT Class 9 History Ch 1 Ancient Civilisations

Answer 1

Im very sure about it.
It was the SUMERIANS who introduced 7-days-a week system.
They made use of a LUNAR CALENDAR with 365 days,divided into 12 months. they also adopted the Sexagesimal(count of 60) system for calculating time.