Who was the first to measure the earth's radius
Correct answer: D. Eratosthenes
- A. Galileo
- B. Copernicus
- C. Ptolemy
- D. Eratosthenes
Explanation
The Greek scholar Eratosthenes estimated Earth's size by comparing noon shadows at two locations and using the angle difference to calculate its circumference and radius. Galileo, Copernicus, and Ptolemy are associated with other major developments in astronomy.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Astronomy and Space
Astronomy covers the structure and motions of the solar system, planets, satellites, comets, asteroids and meteoroids, together with gravity, eclipses, seasons and phases of the Moon. It also introduces stars, galaxies, nebulae, black holes, space telescopes and satellites, while distinguishing rotation from revolution and meteors from meteorites.
Practise Astronomy and Space
286 free Astronomy and Space MCQs from Everyday Science, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Everyday Science questions like this
Everyday Science is on 40 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.