Who discovered that it takes 365 days for earth to orbit the sun?

Answer 1

The number of days in the year has been known at least since biblical times ... several thousand years anyway. As soon as the human species undertook agriculture and based our culture on it, the relationships among the cycles of the earth, sun, and moon were well known ... probably better to anyone dependent on agriculture three thousand years ago than they are to an enlightened individual in today's industrial age.

Answer 2

The concept of a 365 day year dates back as early as ancient Egypt and China, when astronomers observed the apparent cycle of 365 days for reference stars, such as Sirius, to return to their original position, an alternative to the lunar calendar. Later in history when Aristarchus (c.300 BCE), and later Copernicus (c.1500 CE) and Kepler (c.1600), conceived and built upon the idea of Earth orbiting the sun, it would have naturally followed that the sensation of a 365 day year is produced by an orbit of that duration.

Answer 3

The ancient Egyptians were one of the first civilizations to recognize that it takes approximately 365 days for the Earth to orbit the Sun. This understanding laid the foundation for the development of the modern calendar system.

Answer 4

This has been known since prehistoric times. The ancient Babylonians, for instance, certainly knew it.