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Earth radius (denoted as R 🜨 or 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 (an oblate ellipsoid), the radius ranges from a maximum (equatorial radius, denoted a) of nearly 6,378 km (3,963 mi) to a minimum (polar radius, denoted b) of nearly 6,357 km (3,950 mi).
Equal Earth: Pseudocylindrical Equal-area Bojan Šavrič, Tom Patterson, Bernhard Jenny Inspired by the Robinson projection, but retains the relative size of areas. 2011 Natural Earth: Pseudocylindrical Compromise Tom Patterson: Originally by interpolation of tabulated values. Now has a polynomial. 1973 Tobler hyperelliptical: Pseudocylindrical ...
The timeline of wars has been split up in the following periods: List of wars: before 1000; List of wars: 1000–1499; List of wars: 1500–1799; List of wars: 1800–1899; List of wars: 1900–1944; List of wars: 1945–1989; List of wars: 1990–2002; List of wars: 2003–present
Timeline of the War in Afghanistan (2001–2021) Timeline of the Iraq War (2003–2011) Timeline of the 2006 Lebanon War (2006) Timeline of the Gaza War (2008–2009) Timeline of the 2008 South Ossetia War (2008) Timeline of the war in Donbas (2014) Timeline of the 2014 Gaza War; Timeline of the Russian invasion of Ukraine (2022–)
They arrived at a figure for the solar parallax of 9 ± 2 arcseconds, [Note 2] equivalent to an Earth–Sun distance of about 23,000 Earth radii. [28] They were also the first astronomers to have access to an accurate and reliable value for the radius of Earth , which had been measured by their colleague Jean Picard in 1669 as 6,365.6 kilometres .
Google has updated it's aerial maps of Ukraine for the first time since the start of Russia's attack - with images now revealing the full scale of devastation. The contrast is stark in Mariupol.
Although the surface of Earth is best modelled by an oblate ellipsoid of revolution, for small scale maps the ellipsoid is approximated by a sphere of radius a, where a is approximately 6,371 km. This spherical approximation of Earth can be modelled by a smaller sphere of radius R, called the globe in this section. The globe determines the ...
Distance from the Earth to the Sun: ℓ: Radius of the Moon: s: Radius of the Sun: t: Radius of the Earth: D: Distance from the center of Earth to the vertex of Earth's shadow cone d: Radius of the Earth's shadow at the location of the Moon n: Ratio, d/ℓ (a directly observable quantity during a lunar eclipse) x: Ratio, S/L = s/ℓ (which is ...