Past '4 seasons as one' on Earth

The Earth once had no season, the same day of the month, until the Moon appeared.

4.5 billion years ago, scientists believed the Earth had no season. The Earth's surface always receives the same amount of sunlight from day to day during the year, until the Moon appears, according to Nature.

Enjoy a one-way sunset in the suburb of Minsk, Belarus.(Photo: Reuters).

Scientists believe that during that period, the Earth rotated vertically, until it was directly hit by a planet-sized Theia .

The fragments shot into the universe from Theia and the Earth after the extreme impact that created the Moon. The strong impact force also caused the Earth's axis to tilt, starting the formation of seasons on the planet.

According to scientists, the season forms from the Earth's position on elliptical orbits against the Sun , not because of the distance between the Earth and the Sun, but because of the changing direction of the Earth.