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Using the length of the rod and the length of the shadow as the legs of a triangle, he calculated the angle of the sun's rays. [10] This angle was about 7°, or 1/50th the circumference of a circle; assuming the Earth to be perfectly spherical, he concluded that its circumference was 50 times the known distance from Alexandria to Syene (5,000 ...
He faced challenges such as extreme weather and health issues but maintained a walking pace of around 30 km per day. [23] [24] Date Jan. 1, 2009 – June 9, 2013 Duration 4 years, 5 months, 9 days Distance 40,000 kilometres (25,000 mi) Name Tony Mangan: Third runner to successfully run around the world. Having run 50,000 km, he holds the record ...
Dave Kunst walked around the world between 20 June 1970 and 10 October 1974. Rick Hansen, a paraplegic athlete, became the first person to travel around the world in a wheelchair from 21 March 1985 to 22 May 1987, covering over 25,000 mi (40,000 km) through 34 countries on four continents. [81]
Surprisingly, the answer is 2 π m or around 6.3 metres (21 ft). In the second phrasing, considering that 1 metre (3 ft 3 in) is almost negligible compared with the 40,000 km (25,000 mi) circumference, the first response may be that the new position of the string will be no different from the original surface-hugging position.
Earth radius (denoted as R 馃湪 or R E) is the distance from the center of Earth to a point on or near its surface. Approximating the figure of Earth by an Earth spheroid (an oblate ellipsoid), the radius ranges from a maximum (equatorial radius, denoted a) of nearly 6,378 km (3,963 mi) to a minimum (polar radius, denoted b) of nearly 6,357 km (3,950 mi).
The basic unit of length in the imperial and U.S. customary systems is the yard, defined as exactly 0.9144 m by international treaty in 1959. [2] [10] Common imperial units and U.S. customary units of length include: [11] thou or mil (1 ⁄ 1000 of an inch) inch (25.4 mm) foot (12 inches, 0.3048 m) yard (3 feet, 0.9144 m)
10 3: 1 kilometer 2.3 km Length of the Three Gorges Dam, the largest dam in the world [34] [35] 3.1 km Narrowest width of the Strait of Messina, separating Italy and Sicily: 8.848 km Height of Mount Everest, the highest mountain on Earth 10 4: 10 km: 10.9 km Depth of the Challenger Deep in the Mariana Trench, the deepest-known point on Earth's ...
IDEC 3, current outright record holder at 40 days, 23 hours, 30 minutes and 30 seconds. The first around the world sailing record for circumnavigation of the world can be attributed to the surviving crew of Ferdinand Magellan's expedition, including the last captain Juan Sebastián Elcano who completed their journey in 1522.
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