who were the first people to calculate the size of the earth and the earth-moon distance?
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- He measured the angular separation of the Sun and the Moon when its phase was first or third quarter to derive the distance between Earth and Sun in terms of the distance between the Earth and the Moon. Eratosthenes (276-194 BC) also measured the distance between Earth and Sun as 804,000,000 stadia.
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Measuring the Circumference of the Earth We don’t know which unit Eratosthenes used. If he used the Greek measure, his calculation would have been off by about 16 percent. If he used the Egyptian one, his error would have been less than 2 percent off the actual Earth’s circumference of 24,860 miles (40,008 kilometers). A century after Eratosthenes, the Greek astronomer Posidonius of Rhodes (c. 135–51 BCE) calculated the Earth’s circumference.
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Who discovered that the Earth moves around the Sun? The first person to do so ever was as early as the 3rd century BC by Aristarchus of Samos. Unfortunately, his notion gained only few supporters and was summarily rejected. Later in the 16th century, Nicholas Copernicus presented a mathematical model. In the next century, Johannes Kepler made inclusions of elliptical orbits, and Galileo Galilei presented supporting observations made using a telescope.
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Who proved the Earth is round? Eratosthenes, calculated the Earth's radius around 1700 BC.He used the distance between two cities and the angle of the sun's rays made at midsummer at noon. His measurement turned out to be 15 percent too large, but still impressive, considering it was done over 2600 years ago.
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Eratosthenes' Calculation of Earth's Circumference On the Summer Solstice, the Sun shone straight down the well to the very bottom. That meant the Sun must be straight overhead. Eratosthenes had someone measure the distance between Alexandria and Syene. He used that distance, what he knew about the Sun's angles, and a bit of geometry to figure out the size of the Earth.
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Distances within the Solar System If one knows the size of the Earth, and hence the distance between Rochester and Lima, one can calculate the distance between the Earth and the Moon, based on this shift. (Note that this figure is not to scale!) For some reason, none of the ancient Greek astronomers used this simple method of parallax to measure the distance to the Moon.
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- 1 Over time you can develop gum disease, which can be severe enough to destroy the soft tissue and bone that support your teeth (periodontitis) and lead to tooth loss. 2  Heart disease. 3  Some forms of smokeless tobacco increase your heart rate and blood pressure.
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History of Modern Astronomy Telescopes were invented around 1600, and about 1609 the first people began to use them for observing the sky. As already mentioned, Italian astronomer and physicist Galileo Galilei (1561-1642) was one of the first astronomers using a telescope.
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- He used his mathematical knowledge and his geographical curiosity to perform his most famous experiment, the determination of Earth's circumference, in 240 B.C. Eratosthenes knew that at a well in Egypt, near Swenet (in Greek Syene and today Aswan), the Sun appeared directly overhead at precisely noon.
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What Is The Distance To Mars? The first person to ever calculate the distance to Mars was the astronomer Giovanni Cassini, famous for his observations of Saturn. Giovanni made observations of Mars in 1672 from Paris, while his colleague, Jean Richer made the same observation from Cayenne, French Guiana.
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- Anaximander of Miletus was the first ancient Greek to draw a map of  the known world.But the chinesse were the first to create a world  map first.naximander of Miletus was the first ancient Greek to draw a map of  the known world.But the chinesse were the first to create a world  map first.
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Eratosthenes Finds Diameter of Earth! He found that at the same time, in Alexandria, Egypt, approximately 787 km due north of Syene (now Aswan), the angle of inclination of the sun s rays was about 7.2. With these measurements he computed the diameter and circumference of the earth as we will do.
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Eratosthenes Finds Diameter of Earth! Eratosthenes made a remarkably precise measurement of the size of the earth. He knew that at the summer solstice the sun shone directly into a well at Syene at noon.
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James Hutton  (1726-1797) James Hutton (1726-1797) Being the first person to think of the Earth as millions of years old. Farmer and naturalist James Hutton is credited with being the founder of modern geology. The first to determine that the Earth is millions of years old, Hutton believed our planet is continually being formed.
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- Although they knew it was a sphere, they didn't know how big the sphere was. The philosopher Plato (400. ) declared the earth's circumference to be 64,412 kilometers (40,000 miles). Some 150 years later, the mathematician Archimedes estimated it to be 48,309 kilometers (30,000 miles).
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AMERICAN HISTORY EXAM REVIEW The third lunar mission of NASA's Apollo Program, Apollo 11 was crewed by Commander Ne … il Alden Armstrong, Command Module Pilot Michael Collins, and Lunar Module Pilot Edwin Eugene 'Buzz' Aldrin, Jr. Armstrong and Aldrin became the first humans to land on the Moon, while Collins orbited in the Command Module.
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Who Were the First Men on the Moon? Because they were the first men to walk on the Moon, Neil Armstrong and Edwin “Buzz” Aldrin are forever written in history. And since that time, only ten men have had the honor of following in their footsteps.
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Eratosthenes This turned out to be about 7°, or 1/50th the circumference of a circle. Taking the Earth as spherical, and knowing both the distance and direction of Syene, he concluded that the Earth's circumference was fifty times that distance. His knowledge of the size of Egypt was founded on the work of many generations of surveying trips.
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- Eratosthenes determined the earth's size by observing known phenomena and applying basic arithmetic and geometry to them. Here's how he did it. Eratosthenes' methods were simple but effective. All he needed to know was the distance between two locations and what percentage of a circle this distance constituted.
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Pictures of Earth by Planetary Spacecraft This picture of a crescent-shaped Earth and Moon -- the first of its kind ever taken by a spacecraft -- was recorded Sept. 18, 1977, by Voyager 1 when it was 11.66 million kilometers (7.25 million miles) from Earth.
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- Aristarchus around 270 BC derived the Moon's distance from the duration of a lunar eclipse (Hipparchus later found an independent method). It was commonly accepted in those days that the Earth was a sphere (although its size was only calculated a few years later, by Eratosthenes ).
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- The U.S. sent three classes of robotic missions to prepare the way for human exploration: the Rangers (1961-1965) were impact probes, the Lunar Orbiters (1966-1967) mapped the surface to find landing sites, and the Surveyors (1966-1968) were soft landers. The first human landing on the moon was on 20 July 1969.
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Timeline of astronomy Babylonian astronomers discover an 18.6-year cycle in the rising and setting of the Moon. From this they created the first almanacs – tables of the movements of the Sun, Moon and planets for the use in astrology. In 6th century BC Greece, this knowledge is used to predict eclipses.
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Naked eye The Babylonians, Mayans, ancient Egyptians, ancient Indians, and Chinese measured all the basics of their respective time and calendar systems by naked eye: 1  the length of a year and a month to ±0.1 hour or to better than 1 minute (0.001%) 2  the 24 hours of a day, and the equinoxes.
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- Early in the 17th century, two astronomers competed to describe thenature of our solar system.Galileo built a telescope and found new planets and moons.Francesco Sizi ridiculed Galileo’s findings. There must be only sevenplanets, Sizi said.
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Mathematician who discovered that the moon's gravity caused tides on earth? Sir Isaac Newton, a physicist, published his theory of how gravity  from the moon affects tides on earth. On July 5, 1687 Newton  released the Equilibrium Theory of Tides.