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Pythagoras
Pythagoras (6th century BC) was among those said to have originated the idea
Herodotus
In The Histories, written 431-425 BC, Herodotus dismisses a report of the sun observed shining from the north. This arises when discussing the circumnavigation of Africa undertaken by Phoenicians under Necho II c. 610-595 BC. (The Histories, 4.43) His dismissive comment attests to a widespread ignorance of the ecliptic's inverted declination in a Southern Hemisphere.
Plato
Plato (427-347 BC) travelled to southern Italy to study Pythagorean mathematics. When he returned to Athens and established his school, Plato also taught his students that Earth was a sphere though he offered no justifications.
Aristotle
Aristotle (384-322 BC) was Plato's prize student and "the mind of the school." Aristotle observed "there are stars seen in Egypt and [...] Cyprus which are not seen in the northerly regions." Since this could only happen on a curved surface, he too believed Earth was a sphere "of no great size, for otherwise the effect of so slight a change of place would not be quickly apparent." (De caelo, 298a2-10)
Aristotle provided physical and observational arguments supporting the idea of a spherical Earth:
- Every portion of the Earth tends toward the center until by compression and convergence they form a sphere. (De caelo, 297a9-21)
- Travelers going south see southern constellations rise higher above the horizon; and
- The shadow of Earth on the Moon during a lunar eclipse is round. (De caelo, 297b31-298a10)
The first man to give that theory was Galileo. Later on, Christopher Colomb brought the idea again. This time, a large number of people believed it. But until the 18th century at least I would say, I think some people didn't accept that idea.
Possibly early thinkers such as Ptolemy would have considered the axial tilt as a cause of the then known Analemma of the Sun's passage.
That does however need the consideration of a Helio-centric model of the Sun and its planets.
Which brings us to Copernicus, in the 1500s. Who proposed such a model, to the chagrin of The Authorities.
A wise guy (literally), who noticed how ships that sail into ports always appear over the horizon, meaning that the earth is round, or else the ships would have travelled vertically on the "edge of the earth",
The ancient Greeks discovered shape of the Earth was round (sphere) 25 centuries ago. In 1687, Isaac newton said the Earth should be slightly bulged (oblate spheroid).
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Why Galileo agree that earth is round?
Because everyone from the ancient Greeks onwards knew that the Earth is round.
Why do earth round?
because it is!
Did Aristotle think a force keeps a ball rolling along a smooth level on earth?
yes !
Did Magellan discover that the Earth is spherical mass?
No. Earth was known to be spherical long before Magellan was born. Neither Magellan nor Columbus set out to prove that Earth was round. They set out to find if a westward route to Asia was feasible.
Why does the earth revolve and the moon doesn't?
Moon also revolve. Earth revolve round the sun and moon revolve round the earth.
Why did aristotle concluded that earth was round?
Because during a lunar eclipse, Aristotle observed that the shape of the earth was round.
What is Aristotle known for?
Aristotle is the one who found the earth was round.
What does Aristotle have to do with Galileo?
they Both researched that the earth was round
How did Aristotle concluded that earth was round?
Aristotle observed that during a lunar eclipse, the shape of the Earth's shadow on the moon was curved. He reasoned that only a spherical object could cast a curved shadow, leading him to believe that the Earth was round. Additionally, Aristotle noted that as ships sail away from the shore, the hull disappears before the mast, suggesting the curvature of the Earth.
Who was killed for saying that the earth is round?
The round shape of the Earth was discovered by the ancient Greeks around 500 B.C. The first proposal about the Earth's shape was from Pythagoras.
When did Aristotle think the sun goes round the earth?
Aristotle did not believe that the sun goes around the earth. He proposed a geocentric model of the universe where the earth was at the center and celestial bodies moved in circular paths around it.
Did Socrates think EARTH was round?
Yes, most greek philosphers after 500 BC considered it obvious the earth was round, including Socrates, his progidy Plato, and his progidy Aristotle
How did Aristotle know that the earth was not flat way back in 350 BCE?
Aristotle observed that during a lunar eclipse, the shadow of the Earth on the moon was round. He also noted that ships disappear hull first when sailing away and that the stars appear at different angles depending on the observer's location. These observations led him to believe that the Earth was a sphere, not a flat disk.
Aristotle concluded that Earth was round because .?
It always casts a curved shadow during a lunar eclipse
Did socrates say that the earth is round?
Socrates lived in ancient Greece and did not specifically address the shape of the Earth in his writings. The idea that the Earth is round was proposed by other ancient thinkers such as Pythagoras and Aristotle.
What is the shape of earth and how did Aristotle support this idea?
Aristotle believed the Earth was round due to observations such as the curved shadow it casts on the moon during a lunar eclipse. He argued that the Earth's spherical shape was also supported by the fact that different constellations are visible at different latitudes.
What did Aristotle observe that convinced him that the earth is a sphere?
Aristotle observed that during a lunar eclipse, the shadow of the Earth on the moon is round. This led him to conclude that the Earth must be spherical. Additionally, he noted that as ships sail away from the shore, their hulls disappear before their masts, indicating the curvature of the Earth.
