Why did the Sumerians create the calendar

The Sumerian Calendar and the Sumerian system of irrigation were both connected by one thing; farming. Both these inventions made farming easier for the Sumerians.

Explanation:

Based on their observations, they invented a calendar which had 12 months and each month had around 30 days. The days of a month would start and end at sunset. Each day had 12 hours, 6 hours of daylight and 6 hours of night.

1. state-issued photo ids. provide them for free for those who can't afford them.

2. the system we have seems to be working nearly perfectly. seems like about 31 cases per billion votes cast

3. the national policy for hiring new employees which requires proof of eligibility to work. there are something like 20 types of identification which can be used for this.