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There are many ways this can be done. The ancient Greeks measured the lengths of shadows at two different locations a few hundred miles apart on a roughly north…-south baseline at noon on the same day of the year. From this using trigonometry the circumference was computed, then using the relationship of circumference to radius the radius can be computed. Almost surprisingly the figure they got was very close to the modern figure. Columbus repeated this calculation, but due to a combination of bad data in the sources he used (he did not make the measurements himself) and calculation errors on his part he got a result roughly 2/3 of the correct value (an error equivalent to elimination of the pacific ocean and the Americas); which convinced him he could easily sail to China & India. An equivalent calculation can be done using measurements of star positions at night from different locations, using any baseline (e.g. north-south, east-west, diagonals) between the locations as long as the time and day are identical when the measurements are made. (MORE)

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Dear Wiki Questioner, Since the planets are relatively nice spheres, we can use the equation for the volume of a sphere to calculate the volume of a planet given its radius:… V=(4/3) x pi x R^3 Where V is the volume of our planet pi is approximately 3.14159 and R is the radius of our planet For earth, Ve=(4/3) x pi x Re^3 For Jupiter, Vj=(4/3) x pi x (11Re)^3=(4/3) x pi x 1331 xRe^3=1331*Ve So the Volume of Jupiter is 1331 time the volume of Earth. The ratio of their volumes can be expressed as 1331/1 or 1331:1 (MORE)

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Earth's Circumference at the Equator: 24,901.55 miles (40,075.16 km) Earth's Circumference Between the North and South Poles: 24,859.82 miles (40,008 km) Earth's Diameter …at the Equator: 7,926.28 miles (12,756.1 km) Earth's Diameter at the Poles: 7,899.80 miles (12,713.5 km) Average Distance from the Earth to the Sun: 93,020,000 miles (149,669,180 km) Average Distance from the Earth to the Moon: 238,857 miles (384,403.1 km) Radius of Earth = 6 378.1 kilometers or about 3961.3 miles. Radius of the Earth is about: 3440.07 Nautical miles(nm) The radius (the distance from the surface to the middle) of the Earth is 6, 378.1 km. About 6400 kilometers. The Earth's radius is approximately 6,376,136 metres along the equator and approximately 6,376,115 metres along the Prime Meridian. Earth has 3 different radiuses. The mean radius is 6,371 kilometers. The equatorial radius is 6,378.1 kilometers. The polar radius is 6,356.8 kilometers The radius of the earth is approximately 6378.1km (MORE)

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The alkali earth metal with the smallest atomic radius would be beryllium(Be), number four

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Light and radio signals seldom travel in straight lines through air, because the pressure, temperature, and density of air change with altitude. Light and radio signals al…most always curve vertically, and usually downward. If you were to draw a picture of the real earth's surface, with the real path of a light beam or radio signal traveling above it, the surface of the earth would curve downward on the drawing, and the light or radio signal would also curve above it. The distance between the surface and the light or radio signal would change across the drawing, depending on how strongly the signal curved, and in which direction (up or down). It would be possible to distort the drawing in such a way as to make the light or radio signal appear to be a straight line. In order to do that, you'd have to change the curvature of the earth's surface on the drawing, and maintain the original spacing between the surface and the radio signal at every point. The number by which you have to multiply the true earth radius in order to make the light or radio signal's path appear straight on the drawing, is the "effective earth radius factor". It's a characteristic of atmospheric conditions (specifically, the vertical gradient of the atmosphere's index of refraction), and it's used in designing the optimum physical configuration of point-to-point radio links, i.e. how high above the ground to mount the antennas at each end of the link. (MORE)

As it turns out, these stars actually regret the roles responsible for launching their careers into unforgettable stardom. After you read our explanations, perhaps you'll unde…rstand why. (MORE)

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When it comes to basic facts, what you don't know can hurt you, or at the very least surprise you.… (MORE)

As the saying goes, you can't teach an old dog new tricks. Some tricks, however, are so simple that even an old dog or new puppy can learn them. Just practice any of the follo…wing a few times a day with your dog. (MORE)

While traveling with a dog down the open road makes for good memories, doing it properly takes some thought. Help you and your dog enjoy the time you spend journeying together… by keeping these tips in mind. (MORE)

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Radius is the distance from the center of a circle to the outer edge, the same as one-half of the diameter of a circle.

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In Astronomy

The radius of the Earth can be calculated with a method that was discovered by Eratosthenes of Cyrene in the 3rd century BC. The method as an equation is written as: 360 d…egrees/a = circumference/arc length where a is equal to an arc length. (MORE)

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Distance from Earth to Moon is approximately 60.34 times larger than radius of Earth.

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The formula for the Schwarzchild radius of a black hole is given by Rs = (M/Mo) x 3km. Here Mo means the mass of the Sun. For Earth, M/Mo = 0.000 003, that is, Earth has… 0.000 003 x Mo. Thus Earth's Schwarzchild radius is about 1 cm. That means that if a giant squeezed Earth into a diameter less than 2cm, it would be a black hole. (MORE)

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In Astronomy

Nothing, as not volume, but mass exercises gravity. For example: Black holes somethimes are alot smaller than actual suns, but still they have an enormous gravitational force,… this is because a black hole has an extremely high density, so it needs less volume to exercise the same force. (MORE)