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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 a surface of profound complexity. Our … 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
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
The first published reference to the Earth's size appeared around 350 BC, when Aristotle reported in his book On the Heavens that mathematicians had guessed the … See more
Wikipedia text under CC-BY-SA license 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 big is Earth? | Space
WEBJul 6, 2021 · According to NASA, Earth's radius at the equator is 3,963 miles (6,378 kilometers), while the radius at the poles is 3,950 miles (6,356 km). Therefore, the …
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In Depth | Earth – NASA Solar System Exploration
WEBWith a radius of 3,959 miles (6,371 kilometers), Earth is the biggest of the terrestrial planets and the fifth largest planet overall.
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 …
Figure of the Earth - Wikipedia
WEBThe Earth is only approximately spherical, so no single value serves as its natural radius. Distances from points on the surface to the center range from 6,353 km (3,948 mi) to …
Earth Fact Sheet - NSSDCA
WEBNumbers do not add up to exactly 100% due to roundoff and uncertainty. Water is highly variable, typically makes up about 1%. Note that the acceleration values given are for the equator and pole. The standard …
Earth - National Geographic Society
WEBApr 30, 2024 · At the Equator, Earth rotates at about 1,670 kilometers per hour (1,040 miles per hour), while at 45° north, for example, (the approximate latitude of Green Bay, …
Eratosthenes | Biography, Discoveries, Sieve, & Facts
WEBEratosthenes measured Earth’s circumference mathematically using two surface points to make the calculation. He noted that the Sun’s rays fell vertically at noon in Syene (now Aswān ), Egypt , at the summer …
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. …
How Eratosthenes measured the radius of Earth - Medium
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 …
How did the Greeks Measure the Earth’s Circumference?
WEBJun 8, 2021 · Like the age of the Earth, the circumference of the Earth is of a scale far beyond everyday human experience and yet humans, with their mammalian brains …
Al-Biruni's Classic Experiment: How to Calculate the Radius of …
WEBDec 30, 2023 · Abū Rayḥān Al-Bīrūnī, a pioneering Muslim scientist, figured out a truly remarkable and ingenious method to calculate the radius of the earth (and subsequently …
How have we measured the radius of the Earth (old and new)?
WEBThe current, most updated version of WGS84 has more than 4.6 million harmonic terms with an accuracy in "radius" at any given point of 10 km. That is, you could pick any precise …
How Eratosthenes calculated the Earth's circumference
WEBDec 27, 2017 · How an ancient Greek mathematician calculated the Earth's circumference. In the mid-20th century, we began launching satellites into space that would help us …
How to Find the Radius of the Earth? | An Overview - Toppr
WEBWhat is the Radius of the Earth? Radius refers to a line that connects to the centre point of a circle to any point on its outside layer. In simple words, radius refers to that line, …
Explainer: Earth — layer by layer - Science News Explores
WEBNov 11, 2019 · Here’s a primer on Earth’s layers, starting with a journey to the center of the planet. A cut-away of Earth’s layers reveals how thin the crust is when compared to the …
Planet Earth facts and information - National Geographic
WEBWith a radius of 3,959 miles, Earth is the fifth largest planet in our solar system, and it's the only one known for sure to have liquid water on its surface. Earth is also unique in terms …
7.1 Kepler's Laws of Planetary Motion - Physics | OpenStax
WEBEarth appears to be at the center of the solar system because Earth is located at one of the foci of the elliptical orbit of the sun, moon, and other planets. Teacher Support Introduce …
A Comprehensive Guide to the Layers of the Earth | HowStuffWorks
WEBAug 8, 2023 · The core of the Earth has the following characteristics: The inner core has a radius of 1,220 km. The outer core extends to a radius of 3,400 km. The density of the …
Earth radius explained - Everything Explained Today
WEBApproximating the figure of Earth by an Earth spheroid, the radius ranges from a maximum of nearly (equatorial radius, denoted a) to a minimum of nearly (polar radius, denoted b). …
Earth ellipsoid - Wikipedia
WEBAn Earth ellipsoid or Earth spheroid is a mathematical figure approximating the Earth's form, used as a reference frame for computations in geodesy, astronomy, and the …
NASA-Funded Studies Explain How Climate Is Changing Earth’s …
WEBJul 19, 2024 · If emissions continue to rise, lengthening of day from climate change could reach as high as 2.62 milliseconds per century, overtaking the effect of the Moon’s pull …
Earth - Wikipedia
WEBObjects must orbit Earth within this radius, or they can become unbound by the gravitational perturbation of the Sun. Earth, along with the Solar System, is situated in the Milky Way …
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