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    Earth 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 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 Earth can be modeled as a sphere in many ways. This section describes the common ways. The various radii derived here use the notation … See more

    Earth's diameter is simply twice Earth's radius; for example, equatorial diameter (2a) and polar diameter (2b). For the WGS84 ellipsoid, that's respectively:
    • 2a = 12,756.2740 km (7,926.3812 mi),
    • 2b = 12,713.5046 km (7,899.8055 mi). See more

    Overview image
    Location-dependent radii image
    Global radii image

    Geocentric radius
    The geocentric radius is the distance from the Earth's center to a point on the spheroid surface at See more

    The mathematical expressions above apply over the surface of the ellipsoid. The cases below considers Earth's topography, above or below a 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

     
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  3. 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.

  4. Earth radius - Simple English Wikipedia, the free encyclopedia

  5. 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 …

  6. Earth radius - Wikiwand

  7. How to Find the Radius of the Earth? | An Overview - Toppr

  8. 5.4: Measuring the Earth with Eratosthenes - Physics LibreTexts

  9. Earth - Planet, Atmosphere, Geology | Britannica

    WEB4 days ago · With an equatorial radius of 6,378 km (3,963 miles), Earth is the largest of the four inner, terrestrial (rocky) planets, but it is considerably smaller than the gas giants of the outer solar system. Earth has a single …

  10. Earth Radius -- from Eric Weisstein's World of Astronomy

  11. Eratosthenes, Size of the Earth, Radius of the Earth, …

    WEBCombined 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 stadia (singular: …

  12. 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.

  13. Earth Radius by Latitude (WGS 84) - Online calculators

  14. 6.5 Newton’s Universal Law of Gravitation - College Physics 2e

  15. Measuring the radius of the Earth in 240 BC – e=mc2andallthat

  16. Mathematics of Satellite Motion - The Physics Classroom

  17. Mass of the Earth - The Physics Factbook - Hypertextbook

  18. Calculating Radius of Earth Given Speed & Mass - Physics Forums

  19. 13.4 Satellite Orbits and Energy - University Physics Volume 1

  20. What is the radius of the earth equation? - Physics Network

  21. Gravity - Why do we Use Radius of Earth in Calculating

  22. Height is compared to earth radius? - Physics Stack Exchange

  23. What is the radius of the Earth? - BYJU'S

  24. Physicists measured Earth’s rotation using quantum entanglement

  25. What Is the Radius of Earth? - GeeksforGeeks

  26. Here is a hypothesis: Expansion of the Universe is due to ... - Reddit

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