The ancient Egyptian gave the world 6263 years ago the oldest and most accurate calendar known to mankind, which Egypt celebrates on September 11 of every year. It is called the Egyptian Nowruz festival, and this calendar resulted from the ancient Egyptian’s passion for the Nile River and his eagerness to monitor its flood and as a result of the ancient Egyptian’s observation of the star (Sabdat) or Cyrus, the star of Sirius for several years, where they arrived at determining the length of its astronomical cycle with extreme accuracy, as it is undoubtedly In it, by the agreement of all specialists and scholars, that it is the oldest and most accurate correct astronomical calendar in human history to this day.
The ancient Egyptians determined the solar year’s length at 365 days, 5 hours, 49 minutes, and 45 and a half seconds, i.e. a difference of one day every 127 years. The god of knowledge and the measurement of time, in addition to the division of the ancient Egyptian year into three seasons according to the nature of his agricultural life, namely: the season of a flood, sowing seeds, and the season of harvest or spring. The year consisted of 12 months, and the total days of the year were 360 ​​days. The five gods (Osorois – Isis – Nephthys – Set – Horus) were born in it, then added a sixth day every four years, which they presented as a gift to the god (Thoth), who taught them the letter, the word and the calendar.
The ancient Egyptian was holding a carnival of flowers on New Year’s Day that Queen Cleopatra devised to be one of the manifestations of the holiday when the celebration of her sitting on the throne coincided with New Year’s Day. The Egyptian calendar moved across the Mediterranean to Rome when Cleopatra gifted Egypt’s solar calendar to Julius Caesar to replace their lunar calendar. They called it the Caesarian Calendar.