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Earths shape
- 1. S Earth’s Properties Evidence ofEarth’s Shape
- 2. • A lineof sight is the straight, unimpeded path taken by light from an object to an eye. • Objects appear to sink when they move across the ocean and slip below the horizon on a curved surface. 2 LEARNING TARGETS
- 3. •Earth is nearlya perfect sphere. 3 EARTH’S SHAPE •Earth is an oblate spheroid. •flattened at the poles. •bulging at the equator.
- 4. Due to itsdaily rotation, Earth bulges about 40 kilometers at the equator. 4 NOT A PERFECT SPHERE
- 5. Earth looks flaton its surface. 5 NOT A PERFECT SPHERE
- 6. Still, Earth isso close to the shape of a sphere that from any point in space it looks like a perfect sphere. 6 OBLATE SPHEROID An oblate spheroid is a nearly perfect sphere.
- 7. 7 HOW DO WEKNOW EARTH IS A ROUND?
- 8. 8 LETS GO SAILING! Howdid people more than 2000 years ago (14 centuries before Columbus) figure out that Earth was round?
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- 11. He noticed shipsas they approached the horizon. The bottom of the ship appears to sink into the ocean. This is because the Earth is curved. 11 EVIDENCE OF EARTH’S SHAPE Aristotle observed that Earth was a sphere a long time ago! FOSS WEB
- 12. 12 WHAT OTHER EVIDENCEDO WE HAVE TO INDICATE WE LIVE ON GIGANTIC SPHERE! We have photographs of Earth taken from space A lunar eclipse casts earth’s shadow on the moon. A curved shadow is shown. Changing positions of the sun and stars like Polaris in reference to location.
- 13. 13 WHAT OTHER EVIDENCEDO WE HAVE TO INDICATE WE LIVE ON GIGANTIC SPHERE! We have photographs of Earth taken from space A lunar eclipse casts earth’s shadow on the moon. A curved shadow is shown. Changing positions of the sun and stars like Polaris in reference to location.
- 14. 14 WHAT OTHER EVIDENCEDO WE HAVE TO INDICATE WE LIVE ON GIGANTIC SPHERE! We have photographs of Earth taken from space A lunar eclipse casts earth’s shadow on the moon. A curved shadow is shown. Changing positions of the sun and stars like Polaris in reference to location.
- 15. An imaginaryline where the sky meets the Earth or the Ocean. 15 WHAT IS A HORIZON?
- 16. 16 DEBUNKING A FLATEARTH
- 17. 17 RESPONSE SHEET –INVESTIGATION 2
- 18. 18 HOW DO OBSERVATIONSOF SHIPS AT SEA PROVIDE EVIDENCE OF EARTH’S SHAPE? The horizon formed by the sea establishes a visual barrier where it meets the sky. Ships sailing beyond the horizon sail down the curvature of Earth resulting in the illusion of ships sinking. Ships on a flat Earth diminish in size but do not appear to sink into the ocean.
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