All articles starting with J
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Janos Κ. Lanyi
Janos K. Lanyi is a biochemist and biophysicist, Professor Emeritus of Physiology and Biophysics at UC Irvine, known for determining how bacteriorhodopsin pumps protons and halorhodopsin pumps chloride using light.
Jans Koster
Jans Koster (born 1938) is a Dutch swimmer who set two 1500 m freestyle world records (20:22.8 in 1956, 20:03.1 in 1957) and won the 1958 European 400 m freestyle title in Budapest.
Jänschwalde Coal Mine
The Jänschwalde Coal Mine (Tagebau Jänschwalde) was an opencast lignite mine in Brandenburg, Germany, northeast of Cottbus, that extracted about 660 million tonnes of brown coal.
Janschwalde power station
Jänschwalde power station (Kraftwerk Jänschwalde) is a lignite-fired power plant near Cottbus in Brandenburg, Germany, built by East Germany from 1976 and scheduled for complete closure at the end of 2028.
Jansen Panettiere
Jansen Panettiere (1994-2023), American film, TV, and voice actor, younger brother of Hayden Panettiere; known for Robots, The Last Day of Summer, The Walking Dead; died of cardiomegaly with aortic valve complications.
Jansen potash mine
Jansen is an underground potash mine under construction in central Saskatchewan, owned by BHP, with first production expected in mid-2027 and a stated investment of CAD$21.8 billion.
Jansen-de Vries syndrome
Jansen-de Vries syndrome (JDVS, IDDGIP), a rare autosomal dominant developmental disorder from de novo truncating PPM1D variants on 17q23.2, causing intellectual disability, cyclic vomiting, dysmorphism, and high pain threshold; distinct from Jansen's disease.
Jansenism
Jansenism was a Catholic reform movement of the 17th and 18th centuries, centered on Port-Royal and Antoine Arnauld, whose doctrine of grace Rome condemned as heresy in 1653.
Janshakti Janata Dal (जनशक्ति जनता दल)
Janshakti Janata Dal (जनशक्ति जनता दल), or JJD, is Tej Pratap Yadav's Bihar party founded in 2025 after his RJD expulsion; it contested the 2025 Bihar Assembly election independently with 21 first-list candidates.
Jansky
The jansky (Jy) is a non-SI unit of flux density equal to 10⁻²⁶ W m⁻² Hz⁻¹, used mainly in radio astronomy and named for Karl Guthe Jansky.
Janssen (lunar crater)
Janssen is a 200.65-km pre-Nectarian impact crater in the Moon's southeastern highlands, named for French astronomer Pierre Jules César Janssen, partly buried by Nectaris basin ejecta and containing Fabricius and Rimae Janssen.
Janssen (Martian crater)
Janssen is an IAU-approved 158 km impact crater on Mars near 2.7°N, 37.5°E, approved in 1973 and named for French astronomer Pierre Jules César Janssen; distinct from the larger 200.65 km lunar crater of the same name.
Janssen Medal (French Academy of Sciences)
Janssen Medal, French Academy of Sciences astrophysics prize created 1886 by Jules Janssen; first laureate Gustav Kirchhoff (posthumous). Distinct from the Société astronomique de France's Prix Jules Janssen (1897).
Jantar Mantar (जंतर मंतर)
Jantar Mantar (जंतर मंतर), also called Yantra Mandir, is an astronomical observatory in Jaipur, India, built by Sawai Jai Singh II and completed in 1738, with about twenty large masonry instruments used for naked-eye observation.
Jantar Mantar, Jaipur
Jantar Mantar in Jaipur is an early-18th-century open-air observatory of monumental masonry astronomical instruments built by Sawai Jai Singh II around 1727, a UNESCO World Heritage Site since 2010.
Jantar Mantar, New Delhi
Jantar Mantar in New Delhi is an 18th-century open-air astronomical observatory built in 1724 by Maharaja Sawai Jai Singh II of Jaipur, the first of his five such observatories.
Jantje Friese
Jantje Friese (born 1977, Marburg) is a German screenwriter and showrunner who co-created Dark, Netflix's first German original, and 1899 with partner Baran bo Odar, founded DARK WAYS, and now develops Struwwelpeter for HBO Max.
Januarius
Januarius, also known as San Gennaro, was a bishop of Benevento beheaded at Pozzuoli in 305 during Diocletian's persecution, honored as the patron saint of Naples.
January
January, first month of the Gregorian calendar (Ianuarius, named for the Roman god Janus), 31 days; became the civil year's first month in 153 BCE, fixed by Caesar's Julian calendar and Gregory XIII's reform.
January 1
January 1 is the first day of the Gregorian calendar year and New Year's Day in most countries. Its role descends from the Roman consuls' start date, was fixed by Julius Caesar's Julian calendar, and was confirmed by the 1582 Gregorian reform; England adopted it in 1752.
January 10
January 10, the tenth day of the Gregorian year, is marked by Caesar's Rubicon crossing (49 BC), Paine's Common Sense (1776), the London Underground opening (1863), the League of Nations founding (1920), and observances such as World Hindi Day and Tintin Day.
January 11
January 11 is the 11th day of the year in the Gregorian calendar, marking the first insulin injection in 1922 and the birth of Alexander Hamilton.
January 12
January 12 is the twelfth day of the Gregorian year; the date saw the 2010 Haiti earthquake and Hattie Caraway's 1932 election as the first woman elected to the U.S. Senate.
January 13
January 13, the 13th day of the Gregorian year, is a calendar date marked by the 1842 Kabul retreat survivor, the 1915 Avezzano earthquake, Johnny Cash's 1968 Folsom Prison concert, the 2012 Costa Concordia sinking, and holidays including Lohri and Korean American Day.
January 14
January 14, the 14th day of the Gregorian year, is the Julian-calendar "Old New Year" (Novy God), date of Makar Sankranti, World Logic Day, and Ratification Day, and anniversary of the 1784 Treaty of Paris ratification and the 2005 Huygens landing on Titan.
January 15
January 15, the 15th day of the Gregorian year (350 days remain), is marked by Elizabeth I's 1559 coronation, the 1919 Boston Molasses Flood, MLK's 1929 birth, Super Bowl I (1967), Biafra's 1970 surrender, and Wikipedia's 2001 launch.
January 16
January 16, the 16th day of the Gregorian year (Capricorn), marked by Ivan IV's 1547 coronation, the 18th Amendment's 1919 ratification, the 1991 Gulf War air campaign, and the 1992 El Salvador peace accord.
January 17
January 17, the 17th day of the Gregorian year, marks the 1706 birth of Benjamin Franklin, the 1781 Battle of Cowpens, the 1920 start of US Prohibition, Eisenhower's 1961 farewell address, and the 1994 Northridge and 1995 Kobe earthquakes.
January 18
January 18, the 18th day of the Gregorian year, marks the 1778 Cook Hawaii landfall, 1911 first ship aircraft landing, 1919 Paris Peace Conference opening, 1943 Warsaw Ghetto resistance, and 2002 end of Sierra Leone's civil war.
January 19
January 19, the 19th day of the Gregorian year (346/347 days remaining), marks the 1915 first air raid on Britain, Indira Gandhi's 1966 selection as India's first female prime minister, births of Edgar Allan Poe and Dolly Parton, and, in some years, the U.S. MLK Day federal holiday.