Title: NASA evidence Earth is round lunar eclipse horizon stars hemispheres at DuckDuckGo

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## [Empirical evidence for the spherical shape of Earth - Wikipedia](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FEmpirical_evidence_for_the_spherical_shape_of_Earth&rut=1de0a1982c2cc8ac3a6d32e23142bda832729c752a31d78575720023aac4f3f0)

[![Image 1](https://external-content.duckduckgo.com/ip3/en.wikipedia.org.ico)](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FEmpirical_evidence_for_the_spherical_shape_of_Earth&rut=1de0a1982c2cc8ac3a6d32e23142bda832729c752a31d78575720023aac4f3f0)[en.wikipedia.org/wiki/Empirical_evidence_for_the_spherical_shape_of_Earth](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FEmpirical_evidence_for_the_spherical_shape_of_Earth&rut=1de0a1982c2cc8ac3a6d32e23142bda832729c752a31d78575720023aac4f3f0)

[Empirical **evidence** for the spherical shape of **Earth** A sequence of pictures taken at Strait of Magellan, Chile, showing a tanker ship sailing towards the camera and rising over the **horizon**, demonstrating the **Earth's** curvature. Distance at first picture is about 18 km which would imply a theoretical **horizon** vertical drop of about 23 meters.](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FEmpirical_evidence_for_the_spherical_shape_of_Earth&rut=1de0a1982c2cc8ac3a6d32e23142bda832729c752a31d78575720023aac4f3f0)

## [90 Years of Our Changing Views of Earth - NASA](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fwww.nasa.gov%2Fhistory%2F90%2Dyears%2Dof%2Dour%2Dchanging%2Dviews%2Dof%2Dearth%2F&rut=27a9c47a20e0b0a059b6f31bbafa13ae49fa620af1c05bbc3a2c0eb500ec1be7)

[![Image 2](https://external-content.duckduckgo.com/ip3/www.nasa.gov.ico)](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fwww.nasa.gov%2Fhistory%2F90%2Dyears%2Dof%2Dour%2Dchanging%2Dviews%2Dof%2Dearth%2F&rut=27a9c47a20e0b0a059b6f31bbafa13ae49fa620af1c05bbc3a2c0eb500ec1be7)[www.nasa.gov/history/90-years-of-our-changing-views-of-earth/](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fwww.nasa.gov%2Fhistory%2F90%2Dyears%2Dof%2Dour%2Dchanging%2Dviews%2Dof%2Dearth%2F&rut=27a9c47a20e0b0a059b6f31bbafa13ae49fa620af1c05bbc3a2c0eb500ec1be7)

[Indirect **evidence** of the **Earth's** spherical shape has existed for a long time, but the photographic proof was lacking until well into the 20th century. The ancient Greeks believed the **Earth** was **round** and calculated its circumference with remarkable accuracy, while observers inferred our planet's spherical shape as it cast a curved shadow on the Moon during **lunar****eclipses**. With the advent of ...](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fwww.nasa.gov%2Fhistory%2F90%2Dyears%2Dof%2Dour%2Dchanging%2Dviews%2Dof%2Dearth%2F&rut=27a9c47a20e0b0a059b6f31bbafa13ae49fa620af1c05bbc3a2c0eb500ec1be7)

## [What Is the Real Shape of Earth: Round or Flat? - Star Walk](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fstarwalk.space%2Fen%2Fnews%2F7%2Dways%2Dto%2Dprove%2Dthe%2Dearth%2Dis%2Dround&rut=71dd8051ab12d73bc14389ca19121226ca9a26a9d54dfb7480dce7983bf74e0e)

[![Image 3](https://external-content.duckduckgo.com/ip3/starwalk.space.ico)](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fstarwalk.space%2Fen%2Fnews%2F7%2Dways%2Dto%2Dprove%2Dthe%2Dearth%2Dis%2Dround&rut=71dd8051ab12d73bc14389ca19121226ca9a26a9d54dfb7480dce7983bf74e0e)[starwalk.space/en/news/7-ways-to-prove-the-earth-is-round](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fstarwalk.space%2Fen%2Fnews%2F7%2Dways%2Dto%2Dprove%2Dthe%2Dearth%2Dis%2Dround&rut=71dd8051ab12d73bc14389ca19121226ca9a26a9d54dfb7480dce7983bf74e0e) 2026-06-09T00:00:00.0000000

[Time zones, **lunar****eclipses**, ships disappearing over the **horizon**, and different constellations in the Northern and Southern **Hemispheres** all make sense only on a **round** planet. Is **Earth****Round** or Flat? Key Observations If **Earth** were flat, many everyday observations would look very different.](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fstarwalk.space%2Fen%2Fnews%2F7%2Dways%2Dto%2Dprove%2Dthe%2Dearth%2Dis%2Dround&rut=71dd8051ab12d73bc14389ca19121226ca9a26a9d54dfb7480dce7983bf74e0e)

## [How do scientific observations of lunar eclipses demon...](https://duckduckgo.com/l/?uddg=https%3A%2F%2Ffactually.co%2Ffact%2Dchecks%2Fscience%2Flunar%2Declipse%2Devidence%2Dearth%2Dsphericity%2D4833cf&rut=751324560008b59d513da2fd38c92b9617161f44c678740bc68b0ed593ba2a50)

[![Image 4](https://external-content.duckduckgo.com/ip3/factually.co.ico)](https://duckduckgo.com/l/?uddg=https%3A%2F%2Ffactually.co%2Ffact%2Dchecks%2Fscience%2Flunar%2Declipse%2Devidence%2Dearth%2Dsphericity%2D4833cf&rut=751324560008b59d513da2fd38c92b9617161f44c678740bc68b0ed593ba2a50)[factually.co/fact-checks/science/lunar-eclipse-evidence-earth-sphericity-4833cf](https://duckduckgo.com/l/?uddg=https%3A%2F%2Ffactually.co%2Ffact%2Dchecks%2Fscience%2Flunar%2Declipse%2Devidence%2Dearth%2Dsphericity%2D4833cf&rut=751324560008b59d513da2fd38c92b9617161f44c678740bc68b0ed593ba2a50) 2026-04-30T00:00:00.0000000

[Executive summary **Lunar****eclipses** provide one of the oldest, empirically grounded lines of **evidence** that **Earth****is** not flat: observers across centuries noted that the planet's shadow moving across the Moon is always curved, a pattern best explained if **Earth's** silhouette is circular from every direction, as a sphere would present [1] [2].](https://duckduckgo.com/l/?uddg=https%3A%2F%2Ffactually.co%2Ffact%2Dchecks%2Fscience%2Flunar%2Declipse%2Devidence%2Dearth%2Dsphericity%2D4833cf&rut=751324560008b59d513da2fd38c92b9617161f44c678740bc68b0ed593ba2a50)

## [How Do We Know the Earth Isn't Flat? We Asked a NASA Expert: Episode 53](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fwww.nasa.gov%2Fearth%2Fhow%2Ddo%2Dwe%2Dknow%2Dthe%2Dearth%2Disnt%2Dflat%2Dwe%2Dasked%2Da%2Dnasa%2Dexpert%2Depisode%2D53%2F&rut=938e24d5b5ecb9bde3b0a02e46b7d4195eed9665b64036c6eae760b173d613dd)

[![Image 5](https://external-content.duckduckgo.com/ip3/www.nasa.gov.ico)](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fwww.nasa.gov%2Fearth%2Fhow%2Ddo%2Dwe%2Dknow%2Dthe%2Dearth%2Disnt%2Dflat%2Dwe%2Dasked%2Da%2Dnasa%2Dexpert%2Depisode%2D53%2F&rut=938e24d5b5ecb9bde3b0a02e46b7d4195eed9665b64036c6eae760b173d613dd)[www.nasa.gov/earth/how-do-we-know-the-earth-isnt-flat-we-asked-a-nasa-expert-episode-53/](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fwww.nasa.gov%2Fearth%2Fhow%2Ddo%2Dwe%2Dknow%2Dthe%2Dearth%2Disnt%2Dflat%2Dwe%2Dasked%2Da%2Dnasa%2Dexpert%2Depisode%2D53%2F&rut=938e24d5b5ecb9bde3b0a02e46b7d4195eed9665b64036c6eae760b173d613dd) 2025-03-11T00:00:00.0000000

[It put ourselves into context of our solar system and our universe. We have a big **round** Sun and a beautiful **round****Earth** and a **round** Mars. And today we use the roundness of **Earth**, the spherical **Earth**, to use methods in space geodesy to figure out where we are, where we're going. I haven't been lost in years. That's pretty good.](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fwww.nasa.gov%2Fearth%2Fhow%2Ddo%2Dwe%2Dknow%2Dthe%2Dearth%2Disnt%2Dflat%2Dwe%2Dasked%2Da%2Dnasa%2Dexpert%2Depisode%2D53%2F&rut=938e24d5b5ecb9bde3b0a02e46b7d4195eed9665b64036c6eae760b173d613dd)

## [What Scientific Evidence Proves the Earth Is a Sphere?](https://duckduckgo.com/l/?uddg=https%3A%2F%2Ffactually.co%2Ffact%2Dchecks%2Fscience%2Fscientific%2Devidence%2Dearth%2Dsphere%2Dbb48e4&rut=3e5a66c976231feda057f491020b291647d0318accb541c447119ae87ee2dc19)

[![Image 6](https://external-content.duckduckgo.com/ip3/factually.co.ico)](https://duckduckgo.com/l/?uddg=https%3A%2F%2Ffactually.co%2Ffact%2Dchecks%2Fscience%2Fscientific%2Devidence%2Dearth%2Dsphere%2Dbb48e4&rut=3e5a66c976231feda057f491020b291647d0318accb541c447119ae87ee2dc19)[factually.co/fact-checks/science/scientific-evidence-earth-sphere-bb48e4](https://duckduckgo.com/l/?uddg=https%3A%2F%2Ffactually.co%2Ffact%2Dchecks%2Fscience%2Fscientific%2Devidence%2Dearth%2Dsphere%2Dbb48e4&rut=3e5a66c976231feda057f491020b291647d0318accb541c447119ae87ee2dc19) 2026-05-03T00:00:00.0000000

[Executive summary A wide range of independent observations—from ancient **lunar****eclipses** to modern satellite geodesy—converge on the conclusion that **Earth****is** not flat but roughly spherical, more precisely an oblate spheroid (slightly flattened at the poles) [1] [2]. These lines of **evidence** include geometric measurements of shadows and **star** positions, the way ships disappear over the **horizon** ...](https://duckduckgo.com/l/?uddg=https%3A%2F%2Ffactually.co%2Ffact%2Dchecks%2Fscience%2Fscientific%2Devidence%2Dearth%2Dsphere%2Dbb48e4&rut=3e5a66c976231feda057f491020b291647d0318accb541c447119ae87ee2dc19)

## [How can one prove that the world is round? - PhysLink.com](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fwww.physlink.com%2FEducation%2FAskExperts%2Fae535.cfm&rut=69e704f8fd8fd006f26a8aca6570db6e2d44dd3d649f9646fbe06b44e48be809)

[![Image 7](https://external-content.duckduckgo.com/ip3/www.physlink.com.ico)](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fwww.physlink.com%2FEducation%2FAskExperts%2Fae535.cfm&rut=69e704f8fd8fd006f26a8aca6570db6e2d44dd3d649f9646fbe06b44e48be809)[www.physlink.com/Education/AskExperts/ae535.cfm](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fwww.physlink.com%2FEducation%2FAskExperts%2Fae535.cfm&rut=69e704f8fd8fd006f26a8aca6570db6e2d44dd3d649f9646fbe06b44e48be809)

[They certainly didn't fall off the edge of the **earth**! You can also sail or fly around the world. The Greeks discovered that the **earth****is****round** by observing **lunar****eclipses** (i.e. when the **earth** blocks the sun from the moon, casting its **round** shadow on the moon's surface).](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fwww.physlink.com%2FEducation%2FAskExperts%2Fae535.cfm&rut=69e704f8fd8fd006f26a8aca6570db6e2d44dd3d649f9646fbe06b44e48be809)

## [Is Earth Round? - ABOUT SCIENCE](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fabout%2Dscience.org%2Flesson%2Fis%2Dearth%2Dround%2F&rut=ba87be43121784b7b9c06415dfcbac0e75ffd1430776e3375bf13d332b21db96)

[![Image 8](https://external-content.duckduckgo.com/ip3/about-science.org.ico)](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fabout%2Dscience.org%2Flesson%2Fis%2Dearth%2Dround%2F&rut=ba87be43121784b7b9c06415dfcbac0e75ffd1430776e3375bf13d332b21db96)[about-science.org/lesson/is-earth-round/](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fabout%2Dscience.org%2Flesson%2Fis%2Dearth%2Dround%2F&rut=ba87be43121784b7b9c06415dfcbac0e75ffd1430776e3375bf13d332b21db96) 2026-03-16T00:00:00.0000000

[If the **Earth** were flat, the whole ship would just get smaller. The **Eclipse**: During a **lunar****eclipse**, **Earth** casts a shadow on the Moon. That shadow is always curved. Only a sphere casts a **round** shadow from every angle. The **Stars**: As you travel North, new **stars** appear on the **horizon**, and southern **stars** disappear.](https://duckduckgo.com/l/?uddg=https%3A%2F%2Fabout%2Dscience.org%2Flesson%2Fis%2Dearth%2Dround%2F&rut=ba87be43121784b7b9c06415dfcbac0e75ffd1430776e3375bf13d332b21db96)

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