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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.
According to Ewen Montagu, John Godfrey devised this system when he was director of the Naval Intelligence Division (N.I.D.) around the time of World War II. [5] The system employed by the United States Armed Forces rates the reliability of the source as well as the information. The source reliability is rated between A (history of complete ...
Andreas Cellarius 's illustration of the Copernican system, from the Harmonia Macrocosmica. Heliocentrism[ a ] (also known as the heliocentric model) is a superseded astronomical model in which the Earth and planets revolve around the Sun at the center of the universe. Historically, heliocentrism was opposed to geocentrism, which placed the ...
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.
Journalism. Journalistic ethics and standards comprise principles of ethics and good practice applicable to journalists. This subset of media ethics is known as journalism's professional " code of ethics" and the "canons of journalism". [ 1] The basic codes and canons commonly appear in statements by professional journalism associations and ...
Source credibility is "a term commonly used to imply a communicator's positive characteristics that affect the receiver's acceptance of a message." [1] Academic studies of this topic began in the 20th century and were given a special emphasis during World War II, when the US government sought to use propaganda to influence public opinion in support of the war effort.
The Sun was found to be part of a galaxy made up of more than 10 10 stars (10 billion stars). The existence of other galaxies, one of the matters of the great debate, was settled by Edwin Hubble, who identified the Andromeda nebula as a different galaxy, and many others at large distances and receding, moving away from our galaxy.
The United States system of units of 1832 is based on the system in use in Britain prior to the introduction to the British imperial system on January 1, 1826. [6] Both systems are derived from English units, a system which had evolved over the millennia before American independence, and which had its roots in both Roman and Anglo-Saxon units.