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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).
M. Rosenmund, J. Laborde, Martin Hotine 1855 Gall stereographic: Cylindrical Compromise James Gall: Intended to resemble the Mercator while also displaying the poles. Standard parallels at 45°N/S. 1942 Miller = Miller cylindrical: Cylindrical Compromise Osborn Maitland Miller: Intended to resemble the Mercator while also displaying the poles. 1772
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 .
When making a conic map, the map maker arbitrarily picks two standard parallels. Those standard parallels may be visualized as secant lines where the cone intersects the globe—or, if the map maker chooses the same parallel twice, as the tangent line where the cone is tangent to the globe. The resulting conic map has low distortion in scale ...
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–)
Ukraine’s authorities announced on 20 March last year that Russian troops had bombed an art school where about 400 people were sheltering. The city’s administration said many of those ...
13 October: Israel tells over 1m people to evacuate Gaza City. After Israel’s war cabinet ordered a complete siege of Gaza in the wake of the Hamas attack and launched air strikes on northern ...
For a timeline of events from 1801 to 1900, see Timeline of the 19th century; For a timeline of events from 1901 to 1945, see Timeline of the 20th century. For 1914–1918, see Timeline of World War I; For 1939–1945 see Timeline of World War II