The calendar was technically first invented by the Ancient Egyptians.
The flooding of the nile
The ancient Egyptians accomplished many things. They erected the Sphinx and pyramids, and a rich and developed civilization for the time.
No. The Greeks did. __ No they didn't invent the first one. Many cultures developed calendars independently of each other at about the same time. It's hard to tell who was first. The Egyptians devised a the first 365-day calendar about 4236 B.C.E The Babylonians developed a lunar calendar about 4,000 years ago that divided the year into 12 months. The Greek calendar came much later.
Several early civilisations adopted the 365 day calendar. Notably the Ancient Egyptians. Certainly before 3000 BC
The Ancient Africans in Nabta around 6500 BCE built a "stonehenge". The Ancient Egyptians used Astronomy to support Agriculture Calendar.
The Egyptians developed the first accurate calendar.
The Egyptians
Ancient Egyptians were first to create beer.
The shaduf is known as the first device used for lifting water in several ancient civilizations.
The first person was human.
The pyramidThe sphinxThe pots and cups made by clayWorship of the cat