Why is there 30 days in a month?

Answer 1

A month has about 30 days because the months are set up to approximately match the moon's cycles but to complete a eyar evenly in 12 months.

Some motths have 30 days and some have 31 becasue the total for the year needs to add up to 365. August ought to have 30 days, but the month is named for the Roman Emperor Augustus and he insisted that "his" month be no less than July, the month named for Julius Caesar. So August has 31 days and the extra day was taken from February, which was already a bit short .

Answer 2

The rhyme to help remember: "30 days has September, April, June, and November. All the rest have 31. Save February, with 28 days clear, and 29 in each leap year."
Therefore, September, April, June, and November have 30 days.

Answer 3

The 30-day month comes from the ancient Roman calendar, which had months with 30 or 31 days. This calendar was later adapted by the Julian calendar, which influenced our current Gregorian calendar. The uneven distribution of days in months was a way to align the calendar with natural cycles and astronomical events.