The important contribution to navigation made by Eratosthenes in the third-century bc was a reasonably accurate calculation of the circumference of our planet.
Who is Eratosthenes?
Eratosthenes was born in 276 BC and died in 194 BC. He was a well-known poet, mathematician, a researcher in geography, and theorist of music. He was the first to gauge the size of the planet.
The Earth was first measured by Eratosthenes of Cyrene. The precise measurement of Earth's circumference was greatly aided by Eratosthenes' work in the third-century bc.
As a result, the Eratosthenes in the third century bc accurate calculation of the Earth.
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C is the correct answer I hope you get it
The correct answer is - he is the current president of Chechnya.
Ramzan Kadyrov is the the current president of Chechnya. Unlike the former presidents of Chechya that were in constant conflict with Russia, he is actually in very nice relations with the Russian authorities and they have a nice collaboration and mutual support in the recent years.
