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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 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.
This is a list of such named time periods as defined in ... United States home front during World War II (1942–1945 ... Logarithmic timeline shows all history on ...
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
6 November: Palestinian death toll tops 10,000. More than 10,000 in Gaza are killed in the first month of war, according to Gaza’s health ministry.
Jean Picard (21 July 1620 – 12 July 1682) was a French astronomer and priest born in La Flèche, where he studied at the Jesuit Collège Royal Henry-Le-Grand.. He is principally notable for his accurate measure of the size of the Earth, based on a careful survey of one degree of latitude along the Paris Meridian.
The first eon in Earth's history, the Hadean, begins with the Earth's formation and is followed by the Archean eon at 3.8 Ga. [2]: 145 The oldest rocks found on Earth date to about 4.0 Ga, and the oldest detrital zircon crystals in rocks to about 4.4 Ga, [34] [35] [36] soon after the formation of the Earth's crust and the Earth itself.