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Modified Newtonian dynamics. Modified Newtonian dynamics ( MOND) is a theory that proposes a modification of Newton's second law to account for observed properties of galaxies. Its primary motivation is to explain galaxy rotation curves without invoking dark matter, and is one of the most well-known theories of this class.
Doomsday Clock. The Doomsday Clock is a symbol that represents the likelihood of a human-made global catastrophe, in the opinion of the members of the Bulletin of the Atomic Scientists. [1] Maintained since 1947, the clock is a metaphor, not a prediction, for threats to humanity from unchecked scientific and technological advances.
Past predictions First millennium CE Date (CE) Claimant(s) Description Ref. 66–70 Simon bar Giora, Jewish Essenes The Jewish Essene sect of ascetics saw the Jewish uprising against the Romans in 66–70 in Judea as the final end-time battle which would bring about the arrival of the Messiah. By the authority of Simon, coins were minted declaring the redemption of Israel. 2nd century Montanus ...
The World Clock ( German: Weltzeituhr ), also known as the Urania World Clock (German: Urania-Weltzeituhr ), is a large turret-style world clock located in the public square of Alexanderplatz in Mitte, Berlin. By reading the markings on its metal rotunda, the current time in 148 major cities from around the world can be determined. [1]
The Chartres astronomical clock [ fr] in Chartres Cathedral is an astrolabe clock, installed in 1528. It was overhauled, its mechanism replaced by an electric mechanism, in 2009. Haguenau. The facade of the Musée alsacien displays an astronomical clock, a modern copy of the clock of the Ulm Rathaus.
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The Prague astronomical clock or Prague Orloj ( Czech: Pražský orloj [praʃskiː orloj]) is a medieval astronomical clock attached to the Old Town Hall in Prague, the capital of the Czech Republic . The clock was first installed in 1410, making it the third-oldest astronomical clock in the world and the oldest clock still in operation.
The clock was designed and calculated by Jens Olsen (1872–1945), who was a skilled locksmith, and later learned the trade of clockmaking. He also took part in the beginning of the clock's construction, and died in 1945, 10 years before the clock was completed. Description. The clock consists of 12 movements which together have 15,448 parts.
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