Diane Johnson: …the clash of cultures with Lulu in Marrakech (2008), which is set in Morocco. In Lorna Mott Comes Home (2021), a woman returns to the United States after living in France for a number of years.

Paul Auster: …wrote and directed the films Lulu on the Bridge (1998) and The Inner Life of Martin Frost (2007). Having witnessed a friend’s death by lightning as a teenager, he appeared in Act of God (2009), a documentary about lightning-strike survivors. Here and Now: Letters 2008–2011 (2013) is a compilation of…

Kananga, city, south-central Democratic Republic of the Congo, situated just east of the Lulua River, a tributary of the Kasai. It is on road and rail routes to Lubumbashi (southeast) and the Kasai River port of Ilebo (northwest) and has air links to those and other Congolese cities. It was named

fungus: Annotated classification: Order Lulworthiales (incertae sedis; not placed in any subclass) Saprotrophic; ascomata subglobose to pear-shaped, paraphyses absent; asci unitunicate, thin-walled; example genera include Lulworthia and Lindra. Order Meliolales (incertae sedis; not placed in any subclass) Lives on other organisms (biotrophic) in tropical

Awkwafina is an American comedian, actress, and rapper known for her low raspy voice, explicit comedy raps, and quick delivery of comedic one-liners. After she posted her rap song “My Vag” on YouTube in 2012, her fame steadily rose, and she soon landed parts in such movies as Ocean’s Eight (2018),

lumbago, pain in the lower (lumbar) portion of the back. Lumbago is considered by health professionals to be an antiquated term that designates nothing more than lower back pain caused by any of a number of underlying conditions. The pain may be mild or severe, acute or chronic, confined to the

tung tree: cordata), and lumbang tree (A. trisperma), are decorative and are planted as shade trees or as sources of tung oil in the subtropical and tropical areas of many countries, including the American Deep South, where they grow rapidly under favourable soil conditions.

human cardiovascular system: The aorta and its principal branches: The lumbar arteries are arranged in four pairs and supply the muscles of the abdominal wall, the skin, the lumbar vertebrae, the spinal cord, and the meninges (spinal-cord coverings).

vertebral column: …is raised, and (3) a lumbar curve, also anterior, which develops as the child sits and walks. The lumbar curve is a permanent characteristic only of humans and their bipedal forebears, though a temporary lumbar curve appears in other primates in the sitting position. The cervical curve disappears in humans…

human nervous system: The spinal cord: … (C), 12 thoracic (T), 5 lumbar (L), 5 sacral (S), and 1 coccygeal (Coc). Spinal nerve roots emerge via intervertebral foramina; lumbar and sacral spinal roots, descending for some distance within the subarachnoid space before reaching the appropriate foramina, produce a group of nerve roots at the conus medullaris known…

human nervous system: Lumbar plexus: Spinal nerves from lumbar levels L1–L4 contribute to the formation of the lumbar plexus, which, along with the sacral plexus, provides motor, sensory, and autonomic fibers to gluteal and inguinal regions and to the lower extremities. Lumbar roots are organized into dorsal and…

lumbar puncture, direct aspiration (fluid withdrawal) of cerebrospinal fluid (CSF) through a hollow needle. The needle is inserted in the lower back, usually between the third and fourth lumbar vertebrae, into the subarachnoid space of the spinal cord, where the CSF is located. Lumbar puncture is

human cardiovascular system: Superior vena cava and its tributaries: …the diaphragm, the right ascending lumbar vein continues upward as the azygous vein, principal tributaries of which are the right intercostal veins, which drain the muscles of the intercostal spaces. It also receives tributaries from the esophagus, lymph nodes, pericardium, and right lung, and it enters into the superior vena…

herniated disk: …between the fourth and fifth lumbar vertebrae or between the fifth lumbar and first sacral vertebrae). Treatment, depending on the severity of the condition, may include bed rest, analgesic medication (e.g., aspirin), traction, orthopedic support, and physical therapy or surgical removal of the protruded portion of the disk and fusion…

lumber, collective term for harvested wood, whether cut into logs, heavy timbers, or members used in light-frame construction. Lumber is classified as hardwood or softwood. The term often refers specifically to the products derived from logs in a sawmill. Conversion of logs to sawed lumber involves

Lumberton, city, seat (1788) of Robeson county, southern North Carolina, U.S., on the Lumber (Lumbee) River about 30 miles (50 km) south of Fayetteville. Founded about 1787 by John Willis, an officer of the American Revolution, it began as a shipping point for lumber and naval supplies floated

annelid: Annotated classification: Stauronereis, Lumbineris, Onuphis. Order Orbiniida Sedentary; head pointed or rounded without appendages; proboscis eversible and unarmed; body divided into distinct thorax and abdomen; gills arise dorsally from thoracic region; size, minute to 40 cm; examples of genera: Scoloplos,

Lumbini, grove near the southern border of modern-day Nepal where, according to Buddhist legend, Queen Maha Maya stood and gave birth to the future Buddha while holding onto a branch of a sal tree. There are two references to Lumbini as the birthplace of the Buddha in the Pali scripture, the first

Francisco Sá Carneiro was a Portuguese politician who served as prime minister of Portugal (1979–80). A lawyer by profession, Sá Carneiro was elected to the National Assembly in 1969 but resigned in 1973. After a military coup in April 1974, he founded the Partido Popular Democrático (PPD) and

pre-Columbian civilizations: The Initial Period: …Formative by the Peruvian archaeologist Luis G. Lumbreras, began with the introduction of pottery. The earliest ceramics have yielded radiocarbon dates of about 1800 bce, although Rowe has suggested that even a date of 2100 bce is plausible. Ceramics from this period have been found on the central coast between…

annelid: Annotated classification: Order Lumbriculida (earthworms) Male gonopores several segments behind segments containing the testes or, when 2 pairs of testes are present, in more posterior segment; size, minute to 30–40 cm; examples of genera: Haplotaxis, Eisenia, Lumbricus (earthworm),

annelid: Annotated classification: Eisenia, Lumbricus (earthworm), Megascolides. Order Moniligastrida Male gonopores, 1 or 2 pairs on segment posterior to testes; clitellum 1 cell thick; 4 pairs of setae per segment; size, minute to 3 m; examples of genera: Moniligaster, Drawida.

oligochaete: ), Lumbricus terrestris. Oligochaetes are common all over the world. They live in the sea, in fresh water, and in moist soil.

Kipsikis, largest ethnic group of the Southern Nilotic (Kalenjin) language group. They occupy the highlands around the town of Kericho in southwestern Kenya. Like other Nandi speakers, they originated in the highlands north of Lake Rudolf (Lake Turkana) and moved southward at least 1,000 years ago.

Tivoli: The composer H.C. Lumbye (1810–74) conducted the orchestra at Tivoli for its first 30 years, playing popular Viennese dance music as well as his own compositions. Bombing in 1944 destroyed many park buildings, including the old concert hall; a new concert hall, seating 2,000, was opened in…

human respiratory system: The larynx: …vocal cords span the laryngeal lumen. They correspond to elastic ligaments attached anteriorly in the angle of the thyroid shield and posteriorly to a pair of small pyramidal pieces of cartilage, the arytenoid cartilages. The vocal ligaments are part of a tube, resembling an organ pipe, made of elastic tissue.…

lumen, unit of luminous flux, or amount of light, defined as the amount streaming outward through one steradian (a unit of solid angle, part of the volume of space illuminated by a light source) from a uniform point source having an intensity of one candela. The lumen is used in calculations

Christianity: Fourth transition, from 1950: …Constitution on the Church” (Lumen Gentium; “Light of the Nations”), which insisted upon evangelization but presented a larger understanding of God’s grace for those outside the church, and urged missionaries to pursue dialogue.

Sidney Lumet was an American film director who was noted for his psychological dramas, which typically featured characters wrestling with moral or emotional conflicts involving betrayal, corruption, or disillusionment. He was also known for eliciting strong performances from his cast members. (Read

Marissa Mayer: In 2018 Mayer cofounded Lumi Labs, which was involved in “building consumer applications enabled by artificial intelligence.” The company was renamed Sunshine in 2020, and that year it released its first product, Sunshine Contacts, an app for managing contact information.

Lumière brothers, were French inventors and pioneer manufacturers of photographic equipment who devised an early motion-picture camera and projector called the Cinématographe (“cinema” is derived from this name). Auguste Lumière (b. October 19, 1862, Besançon, France—d. April 10, 1954, Lyon) and

Lumière brothers: …to Lyon set Louis and Auguste to work on the problem of combining animation with projection. Louis found the solution, which was patented in 1895. At that time they attached less importance to this invention than to improvements they had made simultaneously in colour photography. But on December 28, 1895,…

Lumière brothers: Louis worked on the problem of commercially satisfactory development of film; at 18 he had succeeded so well that with his father’s financial aid he opened a factory for producing photographic plates, which gained immediate success. By 1894 the Lumières were producing some 15 million…

Alain Mabanckou: Nonfiction and translations: …and Lumières de Pointe-Noire (2013; The Lights of Pointe-Noire), described by one critic as “a dazzling meditation on homecoming and belonging.” Le Sanglot de l’homme noir (2012; The Tears of the Black Man) is a collection of literary criticism.

Enlightenment, a European intellectual movement of the 17th and 18th centuries in which ideas concerning God, reason, nature, and humanity were synthesized into a worldview that gained wide assent in the West and that instigated revolutionary developments in art, philosophy, and politics. Central

luminaire, Complete lighting unit, consisting of one or more lamps (bulbs or tubes that emit light), along with the socket and other parts that hold the lamp in place and protect it, wiring that connects the lamp to a power source, and a reflector that helps direct and distribute the light.

colour: Tristimulus measurement and chromaticity diagrams: …their different Y values (luminance, or visually perceived brightness).

television: Basic principles of compatible colour: The NTSC system: …amplitude modulated by (1) the luminance signal, to represent changes in the intended luminance, and (2) the chrominance subcarrier, which in turn is amplitude modulated to represent changes in the intended saturation and phase modulated to represent changes in the intended hue. When a colour receiver is tuned to the…

television: Basic principles of compatible colour: The NTSC system: …when viewing white light, the luminance transmission carries the impression of fine detail. Because it employs methods essentially identical to those of a monochrome television system, it can be picked up by black-and-white receivers. The chrominance transmission has no appreciable effect on black-and-white receivers, yet, when used with the luminance…

luminescence, emission of light by certain materials when they are relatively cool. It is in contrast to light emitted from incandescent bodies, such as burning wood or coal, molten iron, and wire heated by an electric current. Luminescence may be seen in neon and fluorescent lamps; television,

bioluminescence, emission of light by an organism or by a laboratory biochemical system derived from an organism. It could be the ghostly glow of bacteria on decaying meat or fish, the shimmering radiance of protozoans in tropical seas, or the flickering signals of fireflies. The phenomenon occurs

lamp: Modern electrical light sources: Luminescent lamps, which produce less heat than incandescent lamps, include electric discharge lamps, semiconductor lamps, and chemical lamps. Of the electric discharge lamps, the fluorescent lamp gives off a neutral white light, the sodium vapour lamp emits a yellow-orange light, and the mercury vapour lamp…

ether, in physics, a theoretical universal substance believed during the 19th century to act as the medium for transmission of electromagnetic waves (e.g., light and X-rays), much as sound waves are transmitted by elastic media such as air. The ether was assumed to be weightless, transparent,

luminism, late 19th-century painting style emphasizing a unique clarity of light. It was characteristic of the works of a group of independent American painters who were directly influenced by the Hudson River school of painting. The term, however, was not coined until 1954 by John Baur, director

bioluminescence: The range and variety of bioluminescent organisms: The entire body of Luminodesmus sequoiae, a millipede found in the Sierra Nevada mountains of California, glows with a diffuse light. Luminous insects include some true flies (order Diptera), notably Arachnocampa luminosa, the larva of which luminesces a greenish blue from a knob at the end of its body.…

luminol, chemical compound that emits a blue fluorescent light when it reacts with certain oxidizing agents. Luminol is most widely known for its application in forensic science, in which it is used to detect the presence of blood at crime scenes. The chemical formula of luminol is C8H7N3O2. It is

luminosity, in astronomy, the amount of light emitted by an object in a unit of time. The luminosity of the Sun is 3.846 × 1026 watts (or 3.846 × 1033 ergs per second). Luminosity is an absolute measure of radiant power; that is, its value is independent of an observer’s distance from an object.

Milky Way Galaxy: The stellar luminosity function: The stellar luminosity function is a description of the relative number of stars of different absolute luminosities. It is often used to describe the stellar content of various parts of the Galaxy or other groups of stars, but it most commonly refers…

luminous intensity, the quantity of visible light that is emitted in unit time per unit solid angle. The unit for the quantity of light flowing from a source in any one second (the luminous power, or luminous flux) is called the lumen. The lumen is evaluated with reference to visual sensation. The

luminous moss, (Schistostega pennata; formerly S. osmundacea), light-reflecting plant of the subclass Bryidae, native to the Northern Hemisphere. It forms green mats in caves, holes in wood or earth, or cavities between rocks or under tree roots. A luminous moss is about one centimetre (12 inch) or

rosary: In Christianity: …set of mysteries, the “luminous mysteries,” or mysteries of light. The five new mysteries celebrate events in Jesus’ ministry, including his baptism; his miracle at Cana, where he turned water into wine; his proclamation of the kingdom of God; the Transfiguration, in which he revealed his divinity to three…

luminous paint, paint that glows in the dark because it contains a phosphor, a substance that emits light for a certain length of time after exposure to an energy source, such as ultraviolet radiation. Zinc sulfide and calcium sulfide are such phosphors. Some luminous paints contain a source of

lighthouse: Geographic range and luminous range: The range at which a light can be seen depends upon atmospheric conditions and elevation. Since the geographic horizon is limited by the curvature of Earth, it can be readily calculated for any elevation by standard geometric methods. In lighthouse work the observer is always assumed…

Marseille: Health: …center in the suburb of Luminy links the region’s hospitals.

human eye: The transduction process: …°C (−220 °F) prelumirhodopsin becomes lumirhodopsin, with a slightly different colour; on warming further, successive changes are permitted until finally retinal is split off from the opsin to give a yellow solution. The important point to appreciate is that only at this stage is the chromatophore group split off; the…

printing: Second generation of phototypesetters: functional: The Lumizip 900 (1959) introduced a further revolutionary change by retaining as moving parts only the lens, which scans in a single movement the fixed series of light matrices so as to photograph at one time the whole line of 20 to 60 letters. Output reaches…

Joanna Lumley is a British actress who is perhaps best known for her work in the television sitcom Absolutely Fabulous. Lumley was born in India, where her father had fought with the British army’s 6th Gurkha Rifles in World War II. During fierce fighting in Burma (Myanmar) in June 1944, his life

Joanna Lumley is a British actress who is perhaps best known for her work in the television sitcom Absolutely Fabulous. Lumley was born in India, where her father had fought with the British army’s 6th Gurkha Rifles in World War II. During fierce fighting in Burma (Myanmar) in June 1944, his life

Elizabeth Fries Lummis Ellet was an American historical writer, best remembered for her several extensive volumes of portraits of American women of the Revolutionary War and of Western pioneer days. Elizabeth Lummis began writing verse as a child. She was educated at the Female Seminary in Aurora,

chemical bonding: Organometallic compounds: However, the lowest unfilled molecular orbital, the LUMO, has π symmetry and can accept electrons from an appropriate d orbital of the metal, and thus it can help the ligand to act as a Lewis acid. It is this ability of the ligand to act as both…

iron processing: Lumps and fines: As-mined iron ore contains lumps of varying size, the biggest being more than 1 metre (40 inches) across and the smallest about 1 millimetre (0.04 inch). The blast furnace, however, requires lumps between 7 and 25 millimetres, so the ore must…

long-eared bat, any of 19 species of small, usually colony-dwelling vesper bats (family Vespertilionidae). Long-eared bats are found in both the Old World and the New World (Plecotus) and in Australia (Nyctophilus). They are approximately 4–7 cm (1.6–2.8 inches) long, not including the 3.5–5.5-cm

charter party: …charter, bareboat charter, and “lump-sum” contract. The voyage charter is the most common. Under this method a ship is chartered for a one-way voyage between specific ports with a specified cargo at a negotiated rate of freight. On time charter, the charterer hires the ship for a stated period…

charter party: …charter, bareboat charter, and “lump-sum” contract. The voyage charter is the most common. Under this method a ship is chartered for a one-way voyage between specific ports with a specified cargo at a negotiated rate of freight. On time charter, the charterer hires the ship for a stated period…

Jainism: Late medieval–early modern developments (1100–1800): …practice of image worship, the Lumpaka, or Lonka Gaccha, did not. Founded by the mid-15th-century layman Lonka Shah, the Lonka Gaccha denied the scriptural warranty of image worship and in the 17th century emerged as the non-image-worshipping Sthanakavasi sect. At the end of the 18th century, the Sthanakavasi underwent a…

breast cancer: Treatment: A lumpectomy removes only the cancerous mass and a small amount of surrounding tissue; a simple mastectomy removes the entire breast; and a modified radical mastectomy removes the breast along with adjacent lymph nodes. Radical mastectomies involving removal of the breast, underlying muscle, and other tissue…

Lumpenproletariat, (German: “rabble proletariat”), according to Karl Marx in The Communist Manifesto, the lowest stratum of the industrial working class, including also such undesirables as tramps and criminals. The members of the Lumpenproletariat—this “social scum,” said Marx—are not only

Latin American literature: Post-boom writers: …discussed novel is Lumpérica (1983; E. Luminata); it is a text laden with stylistic games and a vague plot. With Puerto Ricans Ana Lydia Vega and Rosario Ferré, Eltit became part of an established group of women Latin American writers who were quickly accepted into the Latin American canon.

lumpsucker, any of certain marine fish of the family Cyclopteridae (order Scorpaeniformes), found in cold northern waters. Lumpsuckers are thickset, short-bodied, scaleless fish with skins that are either smooth or studded with bony tubercles. Like the snailfish, which are often included in the

Bangkok: History of Bangkok: …first and largest recreational area—Lumphini Park. During Rama VII’s reign (1925–35) municipal areas were delimited as part of a general administrative reorganization aimed at decentralization. In 1937 Bangkok was formally divided into the municipalities of Krung Thep and Thon Buri. At the time of their establishment, the two municipalities,…

American literature: Critics of society: …Call Home the Heart and Grace Lumpkin’s To Make My Bread (both 1932). Other notable proletarian novels included Jack Conroy’s The Disinherited (1933), Robert Cantwell’s The Land of Plenty (1934), and Albert Halper’s Union Square (1933), The Foundry (1934), and The Chute (1937), as well as some grim evocations of…

lumpsucker, any of certain marine fish of the family Cyclopteridae (order Scorpaeniformes), found in cold northern waters. Lumpsuckers are thickset, short-bodied, scaleless fish with skins that are either smooth or studded with bony tubercles. Like the snailfish, which are often included in the

Patrice Lumumba was an African nationalist leader, the first prime minister of the Democratic Republic of the Congo (June–September 1960). Forced out of office during a political crisis, he was assassinated a short time later. Lumumba was born in the village of Onalua in Kasai province, Belgian

Patrice Lumumba was an African nationalist leader, the first prime minister of the Democratic Republic of the Congo (June–September 1960). Forced out of office during a political crisis, he was assassinated a short time later. Lumumba was born in the village of Onalua in Kasai province, Belgian

Lumut, port, Peninsular (West) Malaysia, at the mouth of the Dindings River, on the Strait of Malacca. Lumut lies about 48 miles (77 km) southwest of the tin-mining town of Ipoh. It is the main town of the Dindings coastal area and the best sheltered deepwater port in Malaysia. A Royal Malaysian

Lunyu, one of four texts of Confucianism that, when published together in 1190 by the Neo-Confucian philosopher Zhu Xi, became the great Chinese classic known as Sishu (“Four Books”). Lunyu has been translated into English as The Analects of Confucius. Lunyu is considered by scholars to be the most

John Rich was an English theatre manager and actor, the popularizer of English pantomime and founder of Covent Garden Theatre. Rich was a manager by inheritance; he received a three-quarter share in Lincoln’s Inn Fields Theatre from his father, Christopher Rich, in 1714, and, after running that

Luna, county, southwestern New Mexico, U.S., bordered on the south by Mexico. It is a region of desert and semiarid plains broken by isolated mountains and mountain ranges, in the Mexican Highland section of the Basin and Range Province. The Continental Divide crosses the western section of the

Selene, in Greek and Roman religion, the personification of the moon as a goddess. She was worshipped at the new and full moons. According to Hesiod’s Theogony, her parents were the Titans Hyperion and Theia; her brother was Helios, the sun god (sometimes called her father); her sister was Eos

Luna, any of a series of 25 uncrewed Soviet and later Russian lunar probes launched between 1959 and 2023. Luna 1 (launched January 2, 1959) was the first spacecraft to escape Earth’s gravity. It failed to impact the Moon as planned and became the first artificial object to go into orbit around the

Luna 25, Russian uncrewed spacecraft designed to study the Moon. Luna 25 (originally called Luna-Glob, Russian for “Moon-Globe”) consisted of a probe that was designed to land near the Moon’s south pole, where there is likely water ice under the surface. It launched from the Vostochny Cosmodrome on

Luna-Resource, Russian spacecraft that is designed to land on the Moon. Scheduled for launch about 2025, it will be Russia’s first mission to land on the Moon since the Luna 24 mission in August 1976. Luna-Resource weighs 1,250 kg (2,700 pounds). It is designed to study the effect of the solar wind

Ramón Pérez de Ayala: …miel, luna de hiel (1923; Moons of Honey and Gall) and its sequel, Los trabajos de Urbano y Simona (1923; “The Labours of Urbano and Simona”), treat the contrast between idealistic innocence and the realities of mature romantic love. In Tigre Juan (1926; Tiger Juan) and its sequel, El curandero…

Cesare Pavese: …luna e i falò (1950; The Moon and the Bonfires, 1950), is a bleak, yet compassionate story of a hero who tries to find himself by visiting the place in which he grew up. Several other works are notable, especially La bella estate (1949; in The Political Prisoner, 1955). Shortly…

luna moth, (Actias luna), species of large, showy saturniid moth of eastern North America. Luna moths are pale green and have a wingspread of 10 cm (4 inches). The wings have a thin brown border, and each hind wing has an eyespot and a long tail-like projection. The larvae are green caterpillars

Álvaro de Luna was the constable of Castile, ruling Castile during much of the reign of the weak John II. Luna was the illegitimate son of a noble of Aragonese descent and the only distinguished statesman during a dismal period in Castilian history. He was a skilled politician, a farsighted

Benedict (XIII) was an antipope from 1394 to 1417. He reigned in Avignon, Provence, in opposition to the reigning popes in Rome, during the Western Schism (1378–1417), when the Roman Catholic Church was split by national rivalries claiming the papal throne. Of noble birth, he was professor of canon

Luna 25, Russian uncrewed spacecraft designed to study the Moon. Luna 25 (originally called Luna-Glob, Russian for “Moon-Globe”) consisted of a probe that was designed to land near the Moon’s south pole, where there is likely water ice under the surface. It launched from the Vostochny Cosmodrome on

Luna-Resource, Russian spacecraft that is designed to land on the Moon. Scheduled for launch about 2025, it will be Russia’s first mission to land on the Moon since the Luna 24 mission in August 1976. Luna-Resource weighs 1,250 kg (2,700 pounds). It is designed to study the effect of the solar wind

Anatoly Lunacharsky was a Russian author, publicist, and politician who, with Maxim Gorky, did much to ensure the preservation of works of art during the civil war of 1918–20. Deported in 1898 for his revolutionary activities, Lunacharsky joined the Bolshevik group of the Social Democratic Party

Anatoly Lunacharsky was a Russian author, publicist, and politician who, with Maxim Gorky, did much to ensure the preservation of works of art during the civil war of 1918–20. Deported in 1898 for his revolutionary activities, Lunacharsky joined the Bolshevik group of the Social Democratic Party

Anthony Ashley Cooper, 7th earl of Shaftesbury: …he secured passage of the Lunacy Act of 1845, the first British statute to treat the insane as “persons of unsound mind” rather than social outcasts. He early was associated with the factory reform movement led by Richard Oastler and, in the House of Commons, by Michael Thomas Sadler. In…

Kamehameha V: …elected a cousin, William Charles Lunalilo, to succeed him.

Kamehameha V: …elected a cousin, William Charles Lunalilo, to succeed him.

Lunar Atmosphere and Dust Environment Explorer (LADEE), U.S. spacecraft designed to study the thin lunar atmosphere and the amount of dust in it before it is altered by human activity on the Moon. LADEE, launched on September 6, 2013, was the first spacecraft based on the Modular Common Spacecraft

lunar calendar, any dating system based on a year consisting of synodic months—i.e., complete cycles of phases of the Moon. In every solar year (or year of the seasons) there are about 12.37 synodic months. Therefore, if a lunar-year calendar is to be kept in step with the seasonal year, a periodic

silver nitrate, caustic chemical compound, important as an antiseptic, in the industrial preparation of other silver salts, and as a reagent in analytical chemistry. Its chemical formula is AgNO3. Applied to the skin and mucous membranes, silver nitrate is used either in stick form as lunar caustic

Moon: Effects of impacts and volcanism: …are described by the term crater. The relative ages of lunar craters are indicated by their form and structural features. Young craters have rugged profiles and are surrounded by hummocky blankets of debris, called ejecta, and long light-colored rays made by expelled material hitting the lunar surface. Older craters have…

LCROSS, U.S. spacecraft that was deliberately crashed into the Moon on October 9, 2009, resulting in the discovery of subsurface water. LCROSS was launched on June 18, 2009, from Cape Canaveral, Florida, on an Atlas rocket that also carried the Lunar Reconnaissance Orbiter (LRO), a spacecraft

Metonic cycle, in chronology, a period of 19 years in which there are 235 lunations, or synodic months, after which the Moon’s phases recur on the same days of the solar year, or year of the seasons. The cycle was discovered by Meton (fl. 432 bc), an Athenian astronomer. Computation from modern