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Earth is rounded into an ellipsoid with a circumference of about 40,000 km. It is the densest planet in the Solar System. Of the four rocky planets, it is the largest and most massive. Earth is about eight light-minutes away from the Sun and orbits it, taking a year (about 365.25 days) to complete one revolution.
Adherence to the geocentric model stemmed largely from several important observations. First of all, if the Earth did move, then one ought to be able to observe the shifting of the fixed stars due to stellar parallax. Thus if the Earth was moving, the shapes of the constellations should change considerably over the course of a year. As they did ...
Posidonius calculated the Earth's circumference by reference to the position of the star Canopus.As explained by Cleomedes, Posidonius observed Canopus on but never above the horizon at Rhodes, while at Alexandria he saw it ascend as far as 7 + 1 ⁄ 2 degrees above the horizon (the meridian arc between the latitude of the two locales is actually 5 degrees 14 minutes).
No direct ancestry is known. The surname Zanca (which in the documentation also presents the variants Thanca, Çanca, Tanca; the spelling Zanche is to be understood as the Latin form in the genitive) has been documented in northern Sardinia since the 11th–12th centuries, as testified by condaghes and other sources in which individuals of servile status are mentioned, as well as local ...
First images and view of a sunset and sunrise over Earth at the same time, a solar eclipse by Earth (a celestial body other than the Moon), from the Moon's surface. [39] [40] April 30, 1967 First color image of Earth from the surface of another astronomical object, from the Moon's surface. [41] September 20, 1967 (released November 10th) [42] DODGE
Medieval artistic representation of a spherical Earth – with compartments representing earth, air, and water (c. 1400) The Erdapfel, the oldest surviving terrestrial globe (1492/1493) The spherical shape of the Earth was known and measured by astronomers, mathematicians, and navigators from a variety of literate ancient cultures, including ...
Under the Manichaean view of the universe, the world is formed by ten layers of heaven and eight layers of the Earth. The separated top section depicts paradise, below it are the sun (right) and moon palaces, which are shown in two circles. Then the ten layers of heaven, where angels and the twelve zodiac signs are included.
Earth's crust and mantle, Mohorovičić discontinuity between bottom of crust and solid uppermost mantle. Earth's mantle extends to a depth of 2,890 km (1,800 mi), making it the planet's thickest layer. [20] [This is 45% of the 6,371 km (3,959 mi) radius, and 83.7% of the volume - 0.6% of the volume is the crust].