Question

How did the sumerians add a leap year​

Answer 1

Answer:

The ancient Sumerian calendar divided a year into 12 lunar months of 29 or 30 days. Each month began with the sighting of a new moon. ... To keep the lunar year of 354 days in step with the solar year of 365.25 days, an extra, intercalary month was added every three years or so, much like a Gregorian leap year.

Answer 2

Answer:

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The ancient Sumerian calendar divided a year into 12 lunar months of 29 or 30 days. Each month began with the sighting of a new moon. ... To keep the lunar year of 354 days in step with the solar year of 365.25 days, an extra, intercalary month was added every three years or so, much like a Gregorian leap year.