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Questions and Answers
According to the text, what did Eratosthenes measure?
According to the text, what did Eratosthenes measure?
What was the error in Eratosthenes' measurement of the Earth's circumference in stades?
What was the error in Eratosthenes' measurement of the Earth's circumference in stades?
Where did Eratosthenes observe that no shadows were projected at noon on the summer solstice?
Where did Eratosthenes observe that no shadows were projected at noon on the summer solstice?
What is the mathematical relationship between stades and kilometers according to the text?
What is the mathematical relationship between stades and kilometers according to the text?
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What is the Moho boundary?
What is the Moho boundary?
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According to the text, at what location did Eratosthenes observe that no shadows were projected at noon on the summer solstice?
According to the text, at what location did Eratosthenes observe that no shadows were projected at noon on the summer solstice?
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What was the error in Eratosthenes' measurement of the Earth's circumference in kilometers according to the text?
What was the error in Eratosthenes' measurement of the Earth's circumference in kilometers according to the text?
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What is the mathematical relationship between stades and kilometers according to the text?
What is the mathematical relationship between stades and kilometers according to the text?
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What did Eratosthenes measure according to the text?
What did Eratosthenes measure according to the text?
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What is the Moho boundary according to the text?
What is the Moho boundary according to the text?
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Study Notes
Eratosthenes' Measurements
- Eratosthenes measured the Earth's circumference using observations of shadows at different locations.
- The measurement error in his calculation was about 1,400 stades.
Observation Locations
- Eratosthenes noted that no shadows were cast at noon on the summer solstice in Syene (modern-day Aswan, Egypt).
- In contrast, shadows were present in Alexandria during the same solstice, revealing the Earth's curvature.
Calculation and Conversion
- The estimated error in Eratosthenes' measurement of the Earth's circumference is approximately 222 kilometers.
- The mathematical relationship between stades and kilometers is defined as 1 stade being roughly equivalent to 0.185 kilometers.
Moho Boundary
- The Moho boundary, short for Mohorovičić discontinuity, is the boundary between the Earth's crust and the underlying mantle, marked by a sudden change in seismic wave velocities.
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Description
Test your knowledge on Eratosthenes and his measurement of the Earth in this quiz. Explore the concepts of shadows, solstices, and the geographical locations of Syene and Alexandria.
