Who discovered there were 24 hours in a day?

Answer 1

This is not a discovery it is a definition made by man. The Babylonians were the ones who first divided the time from sunrise to sun set into 12 equal "hours". The time from sunset to sunrise was also split into 12 equal parts. These differed in length from season to season. Still today we have 24 hours to one day but the hours are all of equal length.

The Babylonians are also responsible for the 60 minutes to an hour!

Answer 2

The concept of 24 hours in a day is believed to have been introduced by the ancient Egyptians. They used sundials to divide the day into 12 hours of daylight and 12 hours of darkness. Eventually, this system evolved into our modern 24-hour day.