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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 .
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).
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
Hundreds of thousands of Palestinians travel to the devastated northern Gaza – many for the first time since the early weeks of the 15-month war – after Israel reopens the Netzarim corridor ...
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–)
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
Sixty Years' War: 1754: 1814: 60 years Dutch–Portuguese War: 1601: 1661: 60 years Lelantine War: 710 BC: 650 BC: 60 years Colombian conflict: 1964: Ongoing: 61 years Insurgency in Manipur: 24 November 1964: Ongoing: 60 years, 2 months, 2 weeks and 5 days Israeli–Lebanese conflict: 14 May 1948: August 18, 2006: 58 years, 3 months and 4 days
The flattening of the earth was estimated at 1/294.26 and the earth's equatorial radius was estimated at 6378360.7 metres. [116] In the early 19th century, the Paris meridian's arc was recalculated with greater precision between Shetland and the Balearic Islands by the French astronomers François Arago and Jean-Baptiste Biot.