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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.
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 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.
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.
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The Astrarium of Giovanni Dondi dall'Orologio was a complex astronomical clock built between 1348 and 1364 in Padova, Italy, by the doctor and clock-maker Giovanni Dondi dall'Orologio. The Astrarium had seven faces and 107 moving parts; it showed the positions of the sun, the moon and the five planets then known, as well as religious feast days ...
A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is an approximate harmonic oscillator: It swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates. From its invention in 1656 by Christiaan ...
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]
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