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See all on WikipediaEarth radius - Wikipedia
Earth radius (denoted as R🜨 or $${\displaystyle R_{E}}$$) 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, the radius ranges from a maximum of nearly 6,378 km (3,963 mi) (equatorial radius, denoted a) to a minimum of nearly 6,357 km … See more
Earth's rotation, internal density variations, and external tidal forces cause its shape to deviate systematically from a perfect sphere. Local topography increases the variance, resulting in … See more
The following radii are derived from the World Geodetic System 1984 (WGS-84) reference ellipsoid. It is an idealized surface, and the … See more
The first published reference to the Earth's size appeared around 350 BC, when Aristotle reported in his book On the Heavens that … See more
Geocentric radius
The geocentric radius is the distance from the Earth's center to a point on the spheroid surface at See moreThe mathematical expressions above apply over the surface of the ellipsoid. The cases below considers Earth's topography, above or below a See more
Wikipedia text under CC-BY-SA license Earth radius - Wikiwand
WEBEarth radius 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, the radius ranges from a …
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5.4: Measuring the Earth with Eratosthenes - Physics LibreTexts
WEBOne of the ways to comprehend the thinking of Eratosthenes is to draw the Earth and Sun, showing the angles between the Earth’s core and the lines representing the rays of the …
How to Find the Radius of the Earth? | An Overview - Toppr
WEBLearn how to calculate the radius of the earth using Eratosthenes' method and the formula for circumference. See the definition of radius, diameter, and earth's appearance from …
- Estimated Reading Time: 4 mins
How to Find the Radius of the Earth | Sciencing
WEBFeb 15, 2023 · Learn how to use Eratosthenes' method to calculate the radius of the Earth by comparing the angles of shadows at different locations. Find out the formula, the tips, the error and the modern ways …
Earth Fact Sheet - NSSDCA
WEBFind the equatorial radius, polar radius, and volumetric mean radius of Earth in kilometers, as well as other physical and orbital parameters. The standard acceleration of gravity for Earth is 9.80665 m/s2.
Earth radius - Simple English Wikipedia, the free encyclopedia
WEBEarth radius (represented as R🜨 or ) 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, the radius …
How Eratosthenes measured the radius of Earth | by …
WEBJan 13, 2022 · By using simple trigonometry, Eratosthenes was able to calculate the radius of Earth to a great accuracy. Our sun is so far away that its rays are parallel when they reach the earth.
Eratosthenes, Size of the Earth, Radius of the Earth, …
WEBJun 13, 2021 · Combined with Eratosthenes’ measurement of the radius of the Earth (c. 240 BC) it enabled people to calculate the actual distance to the Moon. The ancient Greeks used a measurement of distance called …
How is the radius of the Earth determined? - Physics Forums
WEBMar 4, 2015 · Scientists use a variety of methods to measure the radius of the Earth, including satellite imagery, triangulation, and measuring the curvature of the Earth’s …
8A05.30 - Eratosthenes' Measurement of Earth's Radius
WEBPlace the model so that one of the pillars is pointed at the light source and gives no shadow. Bend the cardboard and show that the other pillar produces a shadow whose size depends on the radius you have …
Earth radius - WikiMili, The Best Wikipedia Reader
WEBJun 20, 2024 · Earth radius (denoted as R🜨 or ) 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, the …
Earth Radius -- from Eric Weisstein's World of Astronomy
WEBEarth Radius -- from Eric Weisstein's World of Astronomy. The IUGG value for the equatorial radius of the Earth is 6378.137 km (3963.19 statute miles ), giving an …
Mass of the Earth - The Physics Factbook - Hypertextbook
WEBWe know that the acceleration due to gravity is equal to 9.8 m/s 2, the Gravitational constant (G) is 6.673 × 10 −11 Nm 2 /kg 2, the radius of the Earth is 6.37 × 10 6 m, and …
What Is the Radius of Earth? - GeeksforGeeks
WEBMar 18, 2024 · The radius of the Earth is a crucial factor in various scientific calculations, including those related to gravity, atmospheric studies, and geodesy. Additionally, it …
What is the radius of the earth in physics? - ScienceOxygen
WEBSep 20, 2022 · According to data taken by 183 high-school classes participating in a World Year of Physics project, “Measure the Earth with Shadows”, the radius of Earth is 6563 …
E2-02. Measurement Of Radius Of Earth | Physics Lab Demo
WEBMeasurement Of Radius Of Earth. Purpose. To demonstrate how the radius of the earth can be measured using trigonometry. Equipment. Optical board, disc with tabs, and …
Height is compared to earth radius? - Physics Stack Exchange
WEBOct 3, 2020 · You are right, the radius of the Earth does not matter. What does matter is that the height through which the object falls is small compared to the object's distance …
What is the radius of the earth equation? - Physics Network
WEBMay 12, 2023 · The earth rotates once every 23 hours, 56 minutes and 4.09053 seconds, called the sidereal period, and its circumference is roughly 40,075 kilometers. Thus, the …
Why do some planets have moons? A physics expert explains …
WEBThe moon orbiting Earth is a good example of how the Hill sphere radius works. The Earth orbits around the sun, but the moon is close enough to Earth that Earth's gravitational …
Why do some planets have moons? A physics expert explains …
WEBJun 24, 2024 · A physics expert explains why Earth has only one moon while other planets have hundreds ... The Moon orbiting Earth is a good example of how the Hill sphere …
How to measure radius of the Earth in cloudy weather?
WEBThe radius of the earth ($R_{earth}$) can be calculated by measuring how the force of gravity ($g$) falls off with height ($y$): $$R_{earth}=-2g\frac{dy}{dg}$$ This works …
Orbits and Kepler’s Laws - NASA Science Kepler's Laws
WEBMay 2, 2024 · Here are Kepler’s Three Laws: Kepler's First Law: Each planet's orbit about the Sun is an ellipse. The Sun's center is always located at one focus of the ellipse. The …
This mind-blowing map shows Earth’s position within the vast …
WEBJun 26, 2024 · Earth orbits the sun at a distance of 150 million kilometres and the sun orbits the centre of the Milky Way. Specifically, we are in the Orion arm, around 26,500 light …
How to Run on the Moon | WIRED
WEB6 hours ago · The moon's radius is about one-quarter that of the Earth, but it has a much lower mass ... Velocity in physics is a vector. It has a magnitude, which we call its …
Calculating earth's speed using radius and speed of light, etc.
WEBMar 22, 2009 · The formula for calculating Earth's speed is v = 2πr / T, where v is the Earth's speed, r is the radius of Earth's orbit around the sun, and T is the time it takes for …
Why does Earth have only one Moon? | Astronomy.com
WEBJun 24, 2024 · A physics expert explains why Earth has only one moon while other planets have hundreds. By Nicole Granucci, The Conversation | Published: June 24, 2024
What Is Aphelion? Earth Reaches Its Greatest Distance From the …
WEB1 day ago · At aphelion, Earth’s distance from the sun is about 94.5 million miles. Six months later, at the start of January in the winter, Earth is at its closest point to the sun …
Rapidly spinning 'extreme' neutron star discovered by US Navy …
WEB8 hours ago · The rapidly spinning neutron star, or "pulsar," is located within the dense star cluster Glimpse-CO1, which sits in the galactic plane of the Milky Way around 10.7 light …
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