This is another mechanism that might explains, why most of the celestial objects including planets in general, are tend to be round in shape. Since the rotating pattern ( just like a wheel ) is the fundamental mechanism of the Universe, these planets previously were the parts of the mass of nebular gas which being thrown off by this rotating mechanism, in which, the main part of the mass of the nebula, forming the Sun in the center, but the mass which are throwned off then each one rotates and then forms the round planets. This is because, the gravity pulls the mass equally from all sides. Gravity pulls from the center to the edges like the spokes of a bicycle wheel. This makes the overall shape of a planet a sphere, which is a three-dimensional circle. The mechanism might be almost the same as that of the pottery makers, only by the difference that, the rounded pottery are made with the help of hands, but on the planets it is due to the gravitational pressure…
Buddhism says about the rounded shape of the earth. You can see it from this explanation about the continents in Earth which says the first continent is connected to the last continent.
These are the four main continents on earth according to Buddhism which are connected to the next continent as a circle:
1.) Jambudvīpa (Sanskrit) or Jambudīpa (Pāli)
2.) Pūrvavideha or Pubbavideha
3.) Aparagodānīya or Aparagoyāna
Jambudvīpa is connected to Pūrvavideha,
Pūrvavideha is connected to Uttarakuru,
Aparagodānīya is connected to Uttarakuru,
Uttarakuru is connected to Jambudvīpa too.
The rounded shape of the earth made the connection between Uttarakuru and Jambudvīpa. So those four continents in Buddhism indirectly says the rounded shape of the Earth.
When it is midday on the continent of Jambudvīpa, the sun is setting on the continent of Pūrvavideha in the east and rising above the continent of [Apara]godānīya in the west, while it is midnight on the continent of Uttarakuru in the north. When it is midday in [Apara]godānīya, the sun is setting in Jambudvīpa and rising in Uttarakuru, while it is midnight in [Pūrva]videha. When it is midday in Uttarakuru, the sun is setting in [Apara]godānīya and rising in [Pūrva]videha, while it is midnight in Jambudvīpa. When it is midday in [Pūrva]videha, the sun is setting in Uttarakuru and rising in Jambudvīpa, while it is midnight in [Apara]-godānīya. Here when Jambudvīpa is in the east [at sunrise], [Pūrva]videha is in the west. If Jambudvīpa is in the west [at sunset], [Pūrva]videha is in the east. If [Apara]godānīya is in the west, Uttarakuru is in the east. If Uttarakuru is in the west, [Apara]godānīya is in the east. (Page #: 295-296 https://www.bdkamerica.org/system/files/pdf/dBET_T0001_LengthyDiscourses3_2018.pdf)
Uttarakuru is the highest continent of the three continents [besides Jambudvīpa], this
land surpasses the others and so is called Uttarā, which in the Indian language means “highest.”