Who first introduced a leap day and a 24-hour day?

🔺 Ancient Egyptians were the first to realise the need for a leap day. They discovered that the star Sirius lined up with the rising sun around the time of flooding every year and also noticed that Sirius lined up with the sun for about six hours (a ¼ a day) different every year. They inserted a leap day into their calendar for a while but then abandoned it.

🔺 They also invented the 24-hour day, divided into two cycles of 12 hours each, and helped pioneer the concept of time as an entity.

🔺 In the ancient Egyptian calendar, the year had 365 days and consisted of 3 seasons: Akhet (Flood), Peret (Emergence) and Shomu (Summer), plus an intercalary month of five epagomenal days treated as outside the year proper. Each season included 4 months of 30 days.

🔺 According to scientists, the ancient Egyptian calendar was highly accurate, a miracle of its time and contributed to the development of different ancient calendars.

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