Answer:
Sumerian astronomers tracked movements of the stars, planets and the
Moon. Based on their observations, they invented a calendar which had 12 months and each month had around 30 days. Therefore, altogether, 12 months had 360 days. This was the first concept of years, months and days.
.
Explanation: SUMERIAN CALENDAR
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. However, this calendar was not always completely accurate and every 4 years or so, the Sumerians inserted a extra month to the calendar.
Hope this was helpful
Answer:
So not to fall out of sync with the seasons, the Sumerian astronomers introduced an extra month every four years.
Explanation:
