All articles starting with R

RADA

RADA (Royal Academy of Dramatic Art) is a London drama school founded in 1904 by Herbert Beerbohm Tree, chartered 1920, with 169 students. Its three-year BA (Hons) Acting, validated by King's College London, trains actors in the Stanislavsky tradition alongside voice, movement and technical stagecraft courses.

Oct 22, 2026

Rada Główna Opiekuńcza

Rada Główna Opiekuńcza (RGO, Central Welfare Council) was the largest Polish social self-help organization of World War I, aiding war victims in German-occupied Poland from 1916 to 1921.

Oct 22, 2026

Rada of the All-Belarusian Congress

The Rada of the All-Belarusian Congress was the council elected by the First All-Belarusian Congress in Minsk in December 1917, from which the BNR Rada descends.

Oct 22, 2026

Rada of the Belarusian Democratic Republic

The Rada of the Belarusian Democratic Republic, founded in Minsk in December 1917, proclaimed Belarusian independence in 1918 and has been a government in exile since 1919.

RADA Studios

RADA Studios is a performing-arts venue and rehearsal complex at 16 Chenies Street in Bloomsbury, London, operated by the Royal Academy of Dramatic Art (RADA). The building is a former 1882 drill hall.

Radagast

Radagast the Brown (Quenya Aiwendil, 'Lover of Birds') is one of the five Istari in Tolkien's legendarium, a Maia of Yavanna dwelling at Rhosgobel near Mirkwood, famed for sending Gwaihir to free Gandalf and for fading from the War of the Ring.

Sep 24, 2026

Radama I

Radama I was king of Imerina, in the central highlands of Madagascar, from 1810 to 1828. He allied with Britain, reformed the army, and extended Merina rule over much of the island.

Sep 24, 2026

Radama II

Radama II, born Prince Rakoto in 1829, was king of Madagascar from 1861 to 1863, succeeding his mother Queen Ranavalona I; he reopened the kingdom to Europeans and was killed in 1863.

Radamel Falcao

Radamel Falcao García Zárate, El Tigre, Colombian striker born 1986; all-time top scorer for Colombia with 35 goals; Europa League winner with Porto (2011) and Atlético Madrid (2012); career split by a 2014 ACL injury.

Radar

Radar, short for radio detection and ranging, is a sensing technique that transmits radio waves and measures reflections to find a target's distance and direction.

Radar altimeter

A radar altimeter, also called a radio altimeter, is an airborne instrument that measures an aircraft's height above the ground by timing radio signals reflected from the surface.

Radar altimetry

Radar altimetry is a satellite remote sensing technique that times microwave pulses to measure sea surface, ice, and land heights, underpinning sea level monitoring and oceanography.

Radar astronomy

Radar astronomy is the active study of solar system objects by bouncing radio signals off them; its first planetary echo came from Venus in 1961.

Radar chart

A radar chart, also known as a spider chart or star plot, displays multivariate data on axes radiating from a common origin, joined into a closed polygon.

Radar clutter

Radar clutter is the set of unwanted radar echoes, from the ground, sea, precipitation, chaff, and birds, that competes with the intended target and hinders detection.

Radar cross section

Radar cross section (RCS), also called radar signature, is a measure in square meters of how effectively a target reflects radar energy back to the radar.

Radar cross-section measurement

Radar cross-section measurement is an experimental technique that quantifies how strongly a target backscatters radar energy, expressed as an equivalent area in square meters, usually in dBsm.

Radar detector

A radar detector, also called a fuzz buster, is a passive radio receiver that alerts drivers to police speed-measuring radar on the X, K, and Ka bands.

Radar imaging

Radar imaging is a remote sensing technique using radio waves to form images of terrain, ocean, ice, and atmosphere, penetrating clouds and working at night where optical sensors cannot.

Radar in World War II

Radar in World War II covers how Britain, the United States, and the Axis developed radio detection between 1935 and 1945, shaping the Battle of Britain and the Atlantic.

Radar interferometry

Radar interferometry (InSAR) is a remote sensing technique that combines radar signals from two antennas, or one antenna on repeated passes, to measure terrain elevation and surface deformation.

Radar jamming and deception

Radar jamming and deception are electronic warfare techniques that degrade enemy radar: jamming raises receiver noise to hide targets, while deception, including chaff and DRFM devices, injects false returns.

Radar Love

Radar Love is a 1973 hard rock single by Dutch band Golden Earring from Moontan, written by George Kooymans and Barry Hay. It hit No. 13 on the Billboard Hot 100, No. 7 in the UK, and No. 1 in the Netherlands, and is famed for its 47-second drum intro and status as a classic driving song.

Radar meteorology

Radar meteorology is the branch of meteorology that uses radars for weather observations and forecasts; modern Doppler radars also measure wind motion within storms, aiding severe weather warnings.

Radar reflectivity factor

The radar reflectivity factor (Z) measures the power a weather radar receives back from raindrops, snowflakes, and ice particles, usually shown on the logarithmic dBZ scale.

Radar speed gun

A radar speed gun is a Doppler radar device used by police to measure vehicle speed from a distance, first deployed in Glastonbury, Connecticut, in 1947.

RADARSAT

RADARSAT is a Canadian series of Earth observation satellites carrying synthetic aperture radar, which images day or night and through cloud, spanning RADARSAT-1 in 1995, RADARSAT-2 in 2007, and a three-satellite constellation launched in 2019.

Oct 21, 2026

Radboud University Medical Center

Radboudumc (Radboud University Medical Center, formerly Sint Radboud Ziekenhuis and UMC St Radboud) is the university medical center of Nijmegen, Netherlands; founded 1956, legally separate from Radboud University since 2021, with 11 care centers, 41 departments, and about 12,700 employees.