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Aristarchus of Samos (/ ˌ æ r ə ˈ s t ɑːr k ə s /; Greek: Ἀρίσταρχος ὁ Σάμιος, Aristarkhos ho Samios; c. 310 – c. 230 BC) was an ancient Greek astronomer and mathematician who presented the first known heliocentric model that placed the Sun at the center of the universe, with the Earth revolving around the Sun once a year and rotating about its axis once a day.
The nebular hypothesis is the most widely accepted model in the field of cosmogony to explain the formation and evolution of the Solar System (as well as other planetary systems ). It suggests the Solar System is formed from gas and dust orbiting the Sun which clumped up together to form the planets. The theory was developed by Immanuel Kant ...
The Geographic Names Information System is a United States-based geographical database. It is generally reliable for its place names and locations/coordinates. Editors should take care that GNIS uses a different convention for its coordinates, using a particular feature of a location rather than the geometric center that most WikiProjects use.
The gap between the planets Mars and Jupiter disclosed by the Titius–Bode law was filled by the discovery of the asteroids Ceres and Pallas in 1801 and 1802 with many more following. At first, astronomical thought in America was based on Aristotelian philosophy, [85] but interest in the new astronomy began to appear in Almanacs as early as ...
The Colorado Sun. The Colorado Sun is an online news outlet based in Denver, Colorado. It launched on September 10, 2018, to provide long-form, in-depth coverage of news from all around Colorado. [ 2] It was started with two years of funding from blockchain venture capitalists at Civil and from a Kickstarter campaign. [ 3]
All planets orbit the Sun in elliptical orbits (image on the right) and not perfectly circular orbits. [72] The radius vector joining the planet and the Sun has an equal area in equal periods. [73] The square of the period of the planet (one revolution around the Sun) is proportional to the cube of the average distance from the Sun. [74]
The source of this differential rotation is an area of current research in solar astronomy. [ 1] The rate of surface rotation is observed to be the fastest at the equator (latitude φ = 0°) and to decrease as latitude increases. The solar rotation period is 25.67 days at the equator and 33.40 days at 75 degrees of latitude.
720,000 km/h (450,000 mi/h) [ 10] Orbital period. ~230 million years [ 10] The Solar System[ d] is the gravitationally bound system of the Sun and the objects that orbit it. [ 11] It was formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc.