Just because of their ignorance.
Centuries ago, people believed that the Earth was flat and the center of the universe due to limited understanding and observation. However, scientific advancements, such as Galileo's observations and Copernicus' heliocentric model, eventually demonstrated that the Earth is spherical and orbits the sun. This paradigm shift in understanding the natural world led to the acceptance of the Earth's true place in the cosmos.
In the past, people believed the earth was flat and the center of the universe. These beliefs were influenced by religious and cultural teachings, as well as limited scientific understanding. It was not until the 16th century that the heliocentric model was proposed by Copernicus, challenging these long-held beliefs.
No one believed that the earth was flat in the 1600 it was a well know fact that the world was round. This myth that people used to believe that the world was flat didn't exsist before 1870-1920. The myth probably came to existance because it was way more intriguing that Colombus in a world where everyone thought was flat was the only one who believed it was round.
personally I don't think they ever really believed it. Some may have thought so because they thought the horizon was the end of the earth but there is ample evidence that ancient people watched the stars. If you look at the moon it is pretty clear that you are seeing a round ball so I'm sure that by the time people actually began to wonder about it and develop ways to look at the heavens they had already determined the earth was not flat. They used to teach us that Columbus sailed to prove the earth was not flat but that can't be true because the globe was invented long before Columbus was even born.
The people of the Southwest likely used the giant, flat-topped mounds of earth, known as "platform mounds," for ceremonial and religious purposes. These mounds were likely used as elevated platforms for important structures, ceremonies, or community gatherings. Additionally, they may have served as landmarks to demarcate territories or for astronomical observations.
Science and technology have changed the lives of people today by widening the view on life. As in science, we have evolved from what we used to think was right. An example would be the earth, we thought that the earth was flat but we later found out it was round. And also for technology, television and the radio have brought us culture.
"Medieval people" covers a lot of ground. There are people today who still think it's flat. At least some of the ancient Greeks were aware that the Earth was round, and even knew how big it was. The reason Columbus had trouble finding a sponsor for his expedition was not that everyone at the time thought the Earth was flat; the common people may have believed that, but educated people knew better. The problem was that they also knew how big it was (from the Greeks); Columbus thought it was considerably smaller and also thought Asia stuck out further to the east than it really does. The people who refused to sponsor his trip didn't think he'd fall off the edge, they thought he'd run out of supplies and starve... which he would have, if he hadn't run into the Americas long before reaching Asia.
The Geocentric model
no, it was only belived to be. people used to think if you went to the edge of the world you would fall off.
Map projection
A flat representation of the Earth is called a map projection. The surface of the Earth cannot be accurately represented on a flat surface, so there are various way to approximate it. The different way are called projections.
Before the heliocentric model of the solar system, people believed that the Earth was at the center of the universe. This geocentric model was commonly accepted in ancient times and throughout the Middle Ages.