WebSome formulas you’ll need (r = radius of circle / sphere) Circumference of a Circle: Volume of a Sphere: Question 1: What is the radius of the Earth? Use Eratosthenes’ estimate for the circumference of the Earth to find its … WebThe first person to determine the size of Earth was Eratosthenes of Cyrene, who produced a surprisingly good measurement using a simple scheme that combined geometrical calculations with physical observations. Eratosthenes was born around 276 B.C., which is now Shahhat, Libya. ... What is the formula of Earth? ... where R is the radius of Earth ...
How Eratosthenes measured the radius of Earth - Medium
WebThe Radius of the Earth . This is relatively simple to do, as shown in the figures below. ... Historically this was done by Eratosthenes using a known location where the sun was directly overhead and cast no shadow and another location where the shadow at that same time was approximately 7 degrees. Thus the angular distance between these two ... WebSep 7, 2024 · In 200 B.C. Eratosthenes estimated Earth’s circumference at about 46,250 kilometers (28,735 miles). Today we know our planet's circumference is roughly 40,000 kilometers (24,850 miles). Not bad... prof fleming
Who first measured the distance to the Moon? How was it done?
WebMay 31, 2024 · In this way, with a simple rule of three he could calculate the length of the circumference of the Earth. If the angle of incidence gives rise to a length of an arc of circumference equal to the distance between Alexandria and Siena, then the total length will correspond to 360 degrees (the full circumference). WebSep 14, 2024 · Exactly how Eratosthenes calculated the radius of the Earth has been lost. What is presently taught as his method is a simplified version described by Cleomedes. It is unlikely that Eratosthenes assumed the Sun was infinitely distant, since he apparently also estimated the distance to the Sun himself. WebEratosthenes of Cyrene (/ ɛr ə ˈ t ɒ s θ ə n iː z /; Greek: Ἐρατοσθένης [eratostʰénɛːs]; c. 276 BC – c. 195/194 BC) was a Greek polymath: a mathematician, geographer, poet, astronomer, and music theorist.He … remington 783 rifle review