who said the earth was round ?

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https://starchild.gsfc.nasa.gov/docs/StarChild/questions/question54.html

https://starchild.gsfc.nasa.gov/docs/StarChild/questions/question54.html
Who figured out the Earth is round? – NASA
Question: Who figured out the Earth is round? Answer: It has actually been known that the Earth was round since the time of the ancient Greeks. I believe that it was Pythagoras who first proposed that the Earth was round sometime around 500 B.C.
Dr. Alan P Smale
2003 – 2008: Program Executive for Mission Operations and Data Analysis (MO&DA) for the Astrophysics Division, Science Mission Directorate, NASA HQ, managing an extensive and scientifically diverse portfolio of astrophysics missions including Chandra, Spitzer, Gravity Probe-B, GALEX, INTEGRAL, RXTE, Suzaku, Swift, WMAP, and XMM-Newton.
The StarChild Team
The StarChild Team. StarChild has been developed primarily by a duo of middle school teachers who generously volunteered their time and talents to making the StarChild site what it is.

https://en.wikipedia.org/wiki/Spherical_Earth

https://en.wikipedia.org/wiki/Spherical_Earth
Spherical Earth – Wikipedia
[1] [2] In the 3rd century BC, Hellenistic astronomy established the roughly spherical shape of Earth as a physical fact and calculated the Earth’s circumference. This knowledge was gradually adopted throughout the Old World during Late Antiquity and the Middle Ages.

https://www.history.com / news / christopher-columbus-never-set-out-to-prove-the-earth-was-round

https://www.history.com / news / christopher-columbus-never-set-out-to-prove-the-earth-was-round
Christopher Columbus Never Set Out to Prove the Earth was Round
Columbus Sails West There’s just one problem: It’s almost certain that in the 1490s, nobody thought the earth was flat. According to historian Jeffrey Burton Russell, no educated person in the…

https://www.independent.co.uk/life-style/history/ancient-greeks-proved-earth-round-eratosthenes-alexandria-syene-summer-solstice-a8131376.html

https://www.independent.co.uk/life-style/history/ancient-greeks-proved-earth-round-eratosthenes-alexandria-syene-summer-solstice-a8131376.html
How the ancient Greeks proved Earth was round over 2,000 years ago
If the Earth really was a sphere, Eratosthenes could use his observations to estimate the circumference of the entire planet. Since the difference in shadow length is 7 degrees in Alexandria and…

https://en.wikipedia.org/wiki/Galileo_Galilei

https://en.wikipedia.org/wiki/Galileo_Galilei
Galileo Galilei – Wikipedia
Galileo di Vincenzo Bonaiuti de’ Galilei (15 February 1564 – 8 January 1642), commonly referred to as Galileo Galilei ( / ˌɡælɪˈleɪoʊ ˌɡælɪˈleɪ / GAL-il-AY-oh GAL-il-AY, US also / ˌɡælɪˈliːoʊ -/ GAL-il-EE-oh -⁠, Italian: [ɡaliˈlɛːo ɡaliˈlɛi]) or simply Galileo, was an Italian astronomer, physicist and engineer, sometimes described as a polymath.

https://www.worldatlas.com/articles/who-was-the-first-person-to-accurately-measure-the-circumference-of-the-earth.html

https://www.worldatlas.com/articles/who-was-the-first-person-to-accurately-measure-the-circumference-of-the-earth.html
Who Was The First Person To Accurately Measure The … – WorldAtlas
When the ancient Greek philosopher Pythagoras first suggested that the Earth was round in 500 BC, his claim was dismissed as unreasonable. Decades later, Greek philosopher Aristotle proved Pythagoras correct when he concluded that the Earth was spherical by observing celestial bodies from different locations across the planet.

https://en.wikipedia.org/wiki/Eratosthenes

https://en.wikipedia.org/wiki/Eratosthenes
Eratosthenes – Wikipedia
Eratosthenes of Cyrene (/ ɛr ə ˈ t ɒ s θ ə n iː z /; Greek: Ἐρατοσθένης [eratostʰénɛːs]; c. 276 BC – c. 195/194 BC) was a Greek polymath: a mathematician, geographer, poet, astronomer, and music theorist.He was a man of learning, becoming the chief librarian at the Library of Alexandria.His work is comparable to what is now known as the study of geography, and he …

https://www.nasa.gov/history/90-years-of-our-changing-views-of-earth

https://www.nasa.gov/history/90-years-of-our-changing-views-of-earth
90 Years of Our Changing Views of Earth – NASA
The Apollo missions of the late 1960s and early 1970s returned thousands of stunning and memorable images of humanity’s first exploration of another world. Among them are photographs of the Earth taken by the astronauts that show how small and fragile our planet can appear against the blackness and vastness of space.

https://www.aps.org/publications/apsnews/200606/history.cfm

https://www.aps.org/publications/apsnews/200606/history.cfm
This Month in Physics History – American Physical Society
June, ca. 240 B.C. Eratosthenes Measures the Earth. By around 500 B.C., most ancient Greeks believed that Earth was round, not flat. But they had no idea how big the planet is until about 240 B.C., when Eratosthenes devised a clever method of estimating its circumference. It was around 500 B.C. that Pythagoras first proposed a spherical …

https://www.britannica.com/biography/Aristarchus-of-Samos

https://www.britannica.com/biography/Aristarchus-of-Samos
Aristarchus of Samos | Ancient Astronomer & Heliocentrist
Aristarchus of Samos, (born c. 310 bce —died c. 230 bce), Greek astronomer who maintained that Earth rotates on its axis and revolves around the Sun.On this ground, the Greek philosopher Cleanthes the Stoic declared in his Against Aristarchus that Aristarchus ought to be indicted for impiety for putting into motion the hearth of the universe. … lesoutrali bot