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Earth's circumference is the distance around Earth. Measured around the equator, it is 40,075.017 km (24,901.461 mi). Measured passing through the poles, the circumference is 40,007.863 km (24,859.734 mi). [1] Treating the Earth as a sphere, its circumference would be its single most important measurement. [2]
Earth is the third planet from the Sun and the only astronomical object known to harbor life. ... Earth is rounded into an ellipsoid with a circumference of about ...
With a stade of 185 m (607 ft), 804,000,000 stadia is 149,000,000 km (93,000,000 mi), approximately the distance from the Earth to the Sun. Eratosthenes also calculated the Sun's diameter. According to Macrobius, Eratosthenes made the diameter of the Sun to be about 27 times that of the Earth. [17] The actual figure is approximately 109 times. [26]
The Earth's circumference is quite close to 40 million metres. [ 1 ] [ 2 ] Many globes are made with a circumference of one metre, so they are models of the Earth at a scale of 1:40 million. In imperial units, many globes are made with a diameter of one foot [ citation needed ] (about 30 cm), yielding a circumference of 3.14 feet (about 96 cm ...
The 180,000 stadia circumference of Posidonius is close to that which results from another method of measuring the Earth, by timing ocean sunsets from different heights, a method which is inaccurate due to horizontal atmospheric refraction. Posidonius furthermore expressed the distance of the Sun in Earth radii.
The Earth's radius is the distance from Earth's center to its surface, about 6,371 km (3,959 mi). While "radius" normally is a characteristic of perfect spheres, the Earth deviates from spherical by only a third of a percent, sufficiently close to treat it as a sphere in many contexts and justifying the term "the radius of the Earth".
In 2022, he completed an iconic lifetime goal of swimming a distance equivalent to the Earth's circumference. For context, that's about 1.75 million lengths in a 25-yard pool.
With the presumption of a spherical Earth, an expedition commissioned by caliph al-Ma'mun used this fact to calculate Earth's circumference to within 7,920 kilometres (4,920 mi) of the correct value of around 40,000 kilometres (25,000 mi), and possibly as accurately as 180 kilometres (110 mi). [10]