Oskar Hertwig was a German embryologist and cytologist who was the first to recognize that the fusion of the nuclei of the sperm and ovum was the essential event in fertilization. After studying medicine and zoology at Jena, Zürich, and Bonn, he obtained a lectureship in anatomy at the University

Richard von Hertwig was a German biologist particularly noted for the development of the germ-layer theory, which proposes that all organs and tissues are derived variously from three basic tissue layers, and for his contributions to the study of protozoans. Educated at the universities of Zürich,

hertz, unit of frequency. The number of hertz (abbreviated Hz) equals the number of cycles per second. The frequency of any phenomenon with regular periodic variations can be expressed in hertz, but the term is used most frequently in connection with alternating electric currents, electromagnetic

Ford Motor Company: 2000–2008: Surviving the Great Recession: Ford sold Hertz in 2005 and Aston Martin in 2007.

Gustav Hertz was a German physicist who, with James Franck, received the Nobel Prize for Physics in 1925 for the Franck-Hertz experiment. This experiment confirmed the quantum theory that energy can be absorbed by an atom only in definite amounts and provided an important confirmation of the Bohr

Gustav Hertz was a German physicist who, with James Franck, received the Nobel Prize for Physics in 1925 for the Franck-Hertz experiment. This experiment confirmed the quantum theory that energy can be absorbed by an atom only in definite amounts and provided an important confirmation of the Bohr

Gustav Hertz was a German physicist who, with James Franck, received the Nobel Prize for Physics in 1925 for the Franck-Hertz experiment. This experiment confirmed the quantum theory that energy can be absorbed by an atom only in definite amounts and provided an important confirmation of the Bohr

Heinrich Hertz was a German physicist who showed that Scottish physicist James Clerk Maxwell’s theory of electromagnetism was correct and that light and heat are electromagnetic radiations. He received a Ph.D. magna cum laude from the University of Berlin in 1880, where he studied under Hermann von

Heinrich Hertz was a German physicist who showed that Scottish physicist James Clerk Maxwell’s theory of electromagnetism was correct and that light and heat are electromagnetic radiations. He received a Ph.D. magna cum laude from the University of Berlin in 1880, where he studied under Hermann von

Henrik Hertz was a dramatist and poet, once among the most popular Danish dramatists. Orphaned early, Hertz took his first inspiration from an unhappy love affair. Initially, he imitated his friend Johan Ludvig Heiberg, whom he joined in attacking older Romantics. Like Heiberg, he regarded

Henrik Hertz was a dramatist and poet, once among the most popular Danish dramatists. Orphaned early, Hertz took his first inspiration from an unhappy love affair. Initially, he imitated his friend Johan Ludvig Heiberg, whom he joined in attacking older Romantics. Like Heiberg, he regarded

Count Fleet: Breeding and early years: In 1927 John D. Hertz (founder of the Yellow Cab taxicab and Hertz rental car companies) bought a young colt who had exhibited an unusual competitive spirit by having reached out and bitten another horse during a race. That colt, Reigh Count, would bring Hertz his first…

Joseph Herman Hertz was the chief rabbi of the United Hebrew Congregations of the Commonwealth and author of books on Judaism and of influential commentaries on the Bible expressing a fundamentalist viewpoint. Emigrating to New York City as a boy, he was the first rabbinical graduate of the newly

Ewald Friedrich, count von Hertzberg was a Prussian statesman and foreign minister who aimed at the expansion of Prussia and its establishment as the arbiter of Europe through a strong alliance between Britain, the Netherlands, Russia, and Prussia aimed against France, Austria, and Spain. Hertzberg

Aleksandr Ivanovich Herzen was a political thinker, activist, and writer who originated the theory of a unique Russian path to socialism known as peasant populism. Herzen chronicled his career in My Past and Thoughts (1861–67), which is considered to be one of the greatest works of Russian prose.

industrial glass: Strength and fracturing: …what is known as a Hertzian cone fracture, in which an expanding cone of glass is ejected from the side of glass opposite to the impact.

radiation: Effects of Hertzian waves and infrared rays: The effects of Hertzian waves (electromagnetic waves in the radar and radio range) and of infrared rays usually are regarded as equivalent to the effect produced by heating. The longer radio waves induce chiefly thermal agitation of molecules…

J.B.M. Hertzog was a soldier and statesman who held the post of prime minister of the Union of South Africa (see South Africa) from 1924 to 1939. His political principles, as first stated in his speeches in 1912, were “South Africa First” (even before the British Empire) and the “Two Streams

J.B.M. Hertzog was a soldier and statesman who held the post of prime minister of the Union of South Africa (see South Africa) from 1924 to 1939. His political principles, as first stated in his speeches in 1912, were “South Africa First” (even before the British Empire) and the “Two Streams

star: Hertzsprung-Russell diagram: …the main sequence by a gap named for Hertzsprung, who in 1911 became the first to recognize the difference between main-sequence and giant stars. The actual concentration of stars differs considerably in different parts of the diagram. Highly luminous stars are rare, whereas those of low luminosity are very numerous.

Ejnar Hertzsprung was a Danish astronomer who classified types of stars by relating their colour to their absolute brightness—an accomplishment of fundamental importance to modern astronomy. The Hertzsprung-Russell diagram of stellar types was named (in part) for him. In 1913 he established the

Hertzsprung-Russell diagram, in astronomy, graph in which the absolute magnitudes (intrinsic brightness) of stars are plotted against their spectral types (temperatures). Of great importance to theories of stellar evolution, it evolved from charts begun in 1911 by the Danish astronomer Ejnar

Horus, in ancient Egyptian religion, a god in the form of a falcon whose right eye was the sun or morning star, representing power and quintessence, and whose left eye was the moon or evening star, representing healing. Falcon cults, which were in evidence from late predynastic times, were

Heruka, in the Vajrayana Buddhism of Tibet and Central Asia, a fierce protective deity. He is an emanation of the buddha Aksobhya, whose figure is incorporated in his headdress. He is depicted as blue in colour with two arms, which hold a vajra (thunderbolt) and a kapala (skull cup) full of blood.

Heruli, an east Germanic people originally from Scandinavia. They raided towns in the Roman Empire, scoring their greatest success in ad 267, when they captured Byzantium and sacked Greek cities. Two years later, the eastern Heruli were crushingly defeated by the Roman emperor Claudius II Gothicus

Menachem Begin: …1948 the Irgun formed the Ḥerut (“Freedom”) Party with Begin as its head and leader of the opposition in the Knesset (Parliament) until 1967. Begin joined the National Unity government (1967–70) as a minister without portfolio and in 1973 became joint chairman of the Likud (“Unity”) coalition.

Menachem Begin: …1948 the Irgun formed the Ḥerut (“Freedom”) Party with Begin as its head and leader of the opposition in the Knesset (Parliament) until 1967. Begin joined the National Unity government (1967–70) as a minister without portfolio and in 1973 became joint chairman of the Likud (“Unity”) coalition.

retrovirus: Human ERVs (HERVs) have become distributed within human DNA over the course of evolution. They are passed from one generation to the next and make up an estimated 1 to nearly 5 percent of the human genome. HERVs are suspected of having influenced the evolution…

cursillo: …Father Sebastián Gayá, and Bishop Juan Hervas of Ciudad Real, Spain, brings together a group of about 40 men or women from different races, educational backgrounds, and economic and social status for spiritual exercises conducted by a team of priests and laypersons. The exercises are centred on the celebration of…

Geneviève Béjart was a French actress and early member of Molière’s Illustre Théâtre company. Geneviève played as Mlle Hervé, adopting her mother’s name. She acted with the Béjart family company managed by her sister Madeleine before they joined forces with Molière. She attained note as a

Hervé Bazin was a French author whose witty and satirical novels often focus on the problems within families and marriages. Hervé was the great-nephew of the Roman Catholic traditionalist novelist René Bazin. After solid academic training, years of family conflict, and financial and professional

skepticism: The Reformation: ” Similarly, the Catholic scholar Gentian Hervet, in the preface to his 1569 translation of Sextus, saw skeptical arguments as the definitive answer to Calvinism and the way to true Christianity.

Hervey Bay, inlet and city on the Pacific Ocean between Fraser Island and Burnett Heads, southeastern Queensland, Australia. The bay was named in 1770 by the British navigator Captain James Cook and was surveyed in 1804 by the British navigator Matthew Flinders. Measuring 55 by 40 miles (89 by 64

Manuae Atoll, one of the southern Cook Islands, a self-governing state in free association with New Zealand in the South Pacific Ocean. It is a coral atoll of two islets joined by a coral reef enclosing a large lagoon, with a total land area of 2.4 square miles (6.2 square km). Manuae, on the west,

John Hervey, 1st earl of Bristol was the first earl of Bristol in the Hervey line, son of Sir Thomas Hervey and nephew of John Hervey, treasurer to Catherine of Braganza, queen consort of Charles II. He was educated at Clare Hall, Cambridge, and became member of Parliament for Bury St. Edmunds

John Hervey, 1st earl of Bristol was the first earl of Bristol in the Hervey line, son of Sir Thomas Hervey and nephew of John Hervey, treasurer to Catherine of Braganza, queen consort of Charles II. He was educated at Clare Hall, Cambridge, and became member of Parliament for Bury St. Edmunds

John Hervey, Baron Hervey was a politician and wit whose Memoirs of the Reign of George the Second are of first importance and, along with the writings of Horace Walpole, are largely responsible for many of posterity’s impressions of 18th-century England. The eldest surviving son of John Hervey,

Paul Hervieu was a French novelist and playwright, most of whose dramas were tragedies centring on family conflicts and relationships, intended to teach some moral lesson. After training as a lawyer, Hervieu entered the diplomatic service. Later, he began writing novels and short stories, of which

Paul Hervieu was a French novelist and playwright, most of whose dramas were tragedies centring on family conflicts and relationships, intended to teach some moral lesson. After training as a lawyer, Hervieu entered the diplomatic service. Later, he began writing novels and short stories, of which

Georg Herwegh was a poet whose appeal for a revolutionary spirit in Germany was strengthened by a lyric sensitivity. Herwegh was expelled from the theological college at Tübingen and began his literary career as a journalist. Called up for military duty, he tactlessly insulted an officer and was

medal: The Netherlands: …regular professional medalists some, like Steven van Herwyck (c. 1530–67) and Jacob Jonghelinck (1530–1606), who worked in Italy for Leoni, adopted the Italian style, somewhat more idealized than the German. The war with Spain (1568–1648) stimulated the production of propaganda medals, which became a popular vehicle of nationalist sentiment. The…

Henri Herz was a brilliant Austrian pianist, teacher, and composer. Herz studied with his father and Daniel Hünten, then went to the Paris Conservatoire, where his teachers included Antonín Reicha and Victor Dourlen. He toured extensively in Europe, Russia, South America, and the United States,

Rahel Varnhagen von Ense: …such women as Levin and Henriette Herz became the centres of social activity for writers and their followers in Berlin. A sudden loss of fortune in 1806 interrupted Levin’s salon activity, but she was able to resume it after she met Karl August Varnhagen von Ense, a writer and literary…

two-factor theory: …of worker motivation, formulated by Frederick Herzberg, which holds that employee job satisfaction and job dissatisfaction are influenced by separate factors. For example, bad working conditions are likely to be a source of dissatisfaction, but excellent working conditions might not produce correspondingly high rates of satisfaction, whereas other improvements such…

Gerhard Herzberg was a Canadian physicist and winner of the 1971 Nobel Prize for Chemistry for his work in determining the electronic structure and geometry of molecules, especially free radicals—groups of atoms that contain odd numbers of electrons. His work provided the foundation for molecular

Bosnia and Herzegovina, country situated in the western Balkan Peninsula of Europe. The larger region of Bosnia occupies the northern and central parts of the country, and Herzegovina occupies the south and southwest. These historical regions do not correspond with the two autonomous political

Aleksandr Ivanovich Herzen was a political thinker, activist, and writer who originated the theory of a unique Russian path to socialism known as peasant populism. Herzen chronicled his career in My Past and Thoughts (1861–67), which is considered to be one of the greatest works of Russian prose.

Western painting: Germany: …as elsewhere, theory preceded practice: Herzensergiessungen eines kunstliebenden Klosterbruders (“Effusions of an Art-Loving Monk”), by Wilhelm Heinrich Wackenroder, had an immediate and widespread influence upon its publication in 1797. Wackenroder advocated a Christian art closely related to the art of the early German masters and provided the artist with a…

John Heartfield was a German artist best known for his agitprop photomontages—collages of text and imagery found in mass-produced media—and his role in the development of the Dada movement in Berlin. The child of politically active socialist parents, Heartfield (who retained the name Herzfeld until

Theodor Herzl: Later accomplishments: …the city now known as Mount Herzl.

Theodor Herzl was the founder of the political form of Zionism, a movement to establish a Jewish homeland. His pamphlet The Jewish State (1896) proposed that the Jewish question was a political question to be settled by a world council of nations. He organized a world congress of Zionists that met

Herzliyya, city, west central Israel, on the Plain of Sharon and the Mediterranean Sea, at the north of the Tel Aviv–Yafo metropolitan area. Founded in 1924 with the financial backing of American Zionists, it was named for Theodor Herzl, the founder of modern political Zionism. The original

romance: The Tristan story: 1280) and again in Daz Herzmaere by the late 13th-century German poet Konrad von Würzburg. The theme of the outwitting of the jealous husband, common in the fabliaux (short verse tales containing realistic, even coarse detail and written to amuse), is frequently found in 13th-century romance and in lighter…

Herzog, novel by Saul Bellow, published in 1964. The work was awarded the National Book Award for fiction in 1965. Moses Herzog, like many of Bellow’s heroes, is a Jewish intellectual who confronts a world peopled by sanguine, incorrigible realists. Much of the action of the novel takes place

duke, Duke and Duchess equivalentsa European title of nobility, having ordinarily the highest rank below a prince or king (except in countries having such titles as archduke or grand duke). It is one of the five ranks of British nobility and peerage, which, in descending order, are duke, marquess,

Allianz Arena: …designed by the architecture firm Herzog & de Meuron and completed in 2005.

library: Emergence of national collections: …1604 that later became the Herzog August Bibliothek at Wolfenbüttel, one of the finest libraries in Europe (Leibniz was its librarian from 1690 to 1716). A library assembled by the elector Friedrich Wilhelm of Brandenburg was founded in 1659 and later became the Prussian State Library. The collections of the…

Chaim Herzog was an Irish-born Israeli politician, soldier, lawyer, and author. He was an eloquent and passionate spokesman for the Zionist cause and was instrumental in the development of Israel, both as a soldier and as the country’s second longest-serving president (1983–93; after Itzhak Ben-Zvi

André Maurois was a French biographer, novelist, and essayist, best known for biographies that maintain the narrative interest of novels. Born into a prosperous family of textile manufacturers, Maurois came under the influence of the French philosopher and teacher Alain (Émile-Auguste Chartier). He

Isaac Herzog is an Israeli lawyer and politician who has served as president of Israel since 2021. Herzog belongs to the third generation of one of Israel’s most prominent political families. His grandfather, Isaac Halevi Herzog, was the first chief rabbi of Ireland (1925–36) after its independence

Isaac Halevi Herzog was a scholar, author, religious philosopher, lecturer, chief rabbi of the Irish Free State (1925–36), and Ashkenazi chief rabbi of Palestine (later Israel) from 1936. Herzog made significant contributions to reconciling the necessities of modern living with the demands of the

Jacques Herzog and Pierre de Meuron: Friends and schoolmates during childhood, Herzog and de Meuron began at an early age to work together on drawings and models. Neither initially studied architecture in college. Herzog studied commercial design before attending the University of Basel to study biology and chemistry, and de Meuron pursued a degree in civil…

Jacques Herzog and Pierre de Meuron are Swiss architects who, as founders (1978) of the firm Herzog & de Meuron, are known for their reappropriation of traditional architectural elements and their inventive use of both natural and artificial materials. The pair was jointly awarded the Pritzker

Johann Jakob Herzog was a German Protestant theologian, professor of church history (University of Halle, 1847–54) and New Testament exegesis (University of Erlangen, 1854–77), and authority on the Hussite-Waldensian church. He compiled and edited the standard theological reference work

Milan Herzog was a Croatian-born American filmmaker who produced hundreds of instructional films for Encyclopædia Britannica Educational Corp. on a wide range of subjects; those films were shown in classrooms across the United States and overseas. Herzog studied law in Paris and served as a foreign

mass spectrometry: Combined electric and magnetic field analysis: …were built by Mattauch and Richard Herzog in West Germany and by the American physicist Alfred O. Nier and his collaborators. The Mattauch-Herzog geometry is shown in Figure 4. Ions of all masses focus along a line that coincides with the second magnetic field boundary. Many versions of this design…

Roman Herzog was a German politician who served as the second president of reunified Germany (1994–99). Herzog was born and educated in the German state of Bavaria. He earned (1958) a doctorate in law at the University of Munich, where he then served as a teaching assistant and lecturer. By 1966 he

Werner Herzog is a German motion-picture director whose unusual films captured men and women at psychological extremes. With Rainer Werner Fassbinder and Volker Schlöndorff, Herzog led the influential postwar West German cinema movement. During his youth, Herzog studied history, literature, and

Vught, small German Nazi concentration camp near the town of Vught, 2 miles (3 km) south of the city of Hertogenbosch, North Brabant, Netherlands. Set up in early 1943, it was essentially a transit camp for Dutch Jews, some of whom worked on slave-labor projects. All Jewish prisoners were

Herta Müller: …Ever the Hunter), Herztier (1994; The Land of Green Plums), and Heute wär ich mir lieber nicht begegnet (1997; The Appointment). In 1998 Müller received the International IMPAC Dublin Literary Award (the world’s richest literary prize) for The Land of Green Plums. The novel Atemschaukel (The Hunger Angel) was published…

Belgium: Relief, drainage, and soils: …southern Flemish Brabant, and the Hesbaye plateau region of Liège. The area is dissected by the Dender, Senne, Dijle, and other rivers that enter the Schelde (Escaut) River; it is bounded to the east by the Herve Plateau. The Brussels region lies within the Central Plateaus.

Theodore Hesburgh was an American Roman Catholic priest and educator under whose presidency (1952–87) the University of Notre Dame in South Bend, Indiana, became as respected for its academic record as for its athletic one and who achieved national prominence through his public service work.

Theodore Hesburgh was an American Roman Catholic priest and educator under whose presidency (1952–87) the University of Notre Dame in South Bend, Indiana, became as respected for its academic record as for its athletic one and who achieved national prominence through his public service work.

Abraham Joshua Heschel was a Jewish theologian and philosopher, noted for his presentation of the prophetic and mystical aspects of Judaism and for his attempt to construct a modern philosophy of religion on the basis of the ancient and medieval Jewish tradition. After a traditional Jewish

garden and landscape design: Western European: …significant was the garden of Hesdin in Picardy, which became famous throughout France for its automata and water tricks. It was made by a Crusader who, having returned to France by way of Palermo in 1270, no doubt incorporated in his garden what he had seen of Saracenic gardens there…

Hesdin, town, Pas-de-Calais département, Hauts-de-France région, northern France, 20 miles (32 km) north-northeast of Abbeville. It was founded in 1554 by the Holy Roman emperor Charles V and was the birthplace of 18th-century French novelist the Abbé Prévost. It is now an agricultural market

Peter Warlock was an English composer, critic, and editor known for his songs and for his exemplary editions of Elizabethan music. He used his real name chiefly for his literary and editorial work, reserving his assumed name for his musical works. Warlock was largely self-taught but received

Heshen was an infamous Chinese courtier whose influence with the aged Qianlong emperor (reigned 1735–96) allowed him to monopolize major governmental posts and oppress the people. At the age of 25, Heshen was an imperial bodyguard. His handsome features, affable manner, and clever wit made a great

Natalie Portman: Black Swan and Thor series: …a dowdy supermarket cashier in Hesher (2010) and a scientist in the action fantasies Thor (2011), Thor: The Dark World (2013), and Thor: Love and Thunder (2022). She also took on lighter fare, appearing opposite Ashton Kutcher in the romantic comedy No Strings Attached (2011) and portraying a warrior princess…

Judaism: Lunisolar structure: …30 days each (except for Ḥeshvan and Kislev, which sometimes have either 29 or 30 days) and totals 353, 354, or 355 days per year. The average lunar year (354 days) is adjusted to the solar year (365 1 4 days) by the periodic introduction of leap years in order…

Sir Arthur Hesilrige, 2nd Baronet was a leading English Parliamentarian from the beginning of the Long Parliament (1640) to the founding of Oliver Cromwell’s Protectorate (1653). He emerged briefly as a powerful figure during the confusion that followed the fall of the Protectorate in 1659. A

Hesiod was one of the earliest Greek poets, often called the “father of Greek didactic poetry.” Two of his complete epics have survived, the Theogony, relating the myths of the gods, and the Works and Days, describing peasant life. Not a great deal is known about the details of Hesiod’s life. He

Hesiod was one of the earliest Greek poets, often called the “father of Greek didactic poetry.” Two of his complete epics have survived, the Theogony, relating the myths of the gods, and the Works and Days, describing peasant life. Not a great deal is known about the details of Hesiod’s life. He

Hesiod was one of the earliest Greek poets, often called the “father of Greek didactic poetry.” Two of his complete epics have survived, the Theogony, relating the myths of the gods, and the Works and Days, describing peasant life. Not a great deal is known about the details of Hesiod’s life. He

Egyptian art and architecture: Relief sculpture and painting: …dynasty, such as that of Hesire at Ṣaqqārah; it contained mural paintings of funerary equipment and wooden panels carrying figures of Hesire in the finest low relief. Generally speaking, mural decorations were in paint when the ground was mud brick or stone of poor quality and in relief when the…

Nine Inch Nails: …major record label, however, for Hesitation Marks (2013), on which he continued to build dynamic songs from tense textured grooves. Nine Inch Nails later dropped the EP Not the Actual Events (2016), praised as a return to form. It was followed by Add Violence (2017) and Bad Witch (2018). In…

Cambridge: …of Galt, the towns of Hespeler and Preston, and parts of the townships of Waterloo and North Dumfries. Galt was founded about 1816 and, along with Dumfries Township, became the home of large numbers of Scottish immigrants. Hespeler and Preston were settled in the early 1800s, largely by Mennonites from…

Robert Herrick: …book that Herrick published was Hesperides (1648), which included His Noble Numbers, a collection of poems on religious subjects with its own title page dated 1647 but not previously printed. Hesperides contained about 1,400 poems, mostly very short, many of them being brief epigrams. His work appeared after that in…

Benghazi, city and major seaport of northeastern Libya, on the Gulf of Sidra. It was founded by the Greeks of Cyrenaica as Hesperides (Euesperides) and received from the Egyptian pharaoh Ptolemy III the additional name of Berenice in honour of his wife. After the 3rd century ce it superseded Cyrene

Hesperides, in Greek mythology, clear-voiced maidens who guarded the tree bearing golden apples that Gaea gave to Hera at her marriage to Zeus. According to Hesiod, they were the daughters of Erebus and Night; in other accounts, their parents were Atlas and Hesperis or Phorcys and Ceto. They were

Citrus: …modified berry known as a hesperidium, and the flesh is divided into segments packed with tiny juice-filled vesicles. The peel, or rind, of the fruits is leathery and studded with oil glands.

skipper, (family Hesperiidae), any of the approximately 3,500 species of insects (order Lepidoptera) that occur worldwide and are named for their fast, darting flight. Skippers are considered an intermediate form between butterflies and moths. The head and small, stout body of the adult tend to

vespers, evening prayer of thanksgiving and praise in Roman Catholic and certain other Christian liturgies. Vespers and lauds (morning prayer) are the oldest and most important of the traditional liturgy of the hours. Many scholars believe vespers is based on Judaic forms of prayer and point to a

Lepidoptera: Annotated classification: Superfamily Hesperioidea 3,500 species worldwide in 1 family; similar to true butterflies, distinguished from moths by diurnal habits, clubbed antennae, a functional proboscis, and lack of ocelli; adults are fast-flying, with short, usually pointed forewings, broad heads, and antennae usually hooked beyond the club; larvae usually…

Hesperides, in Greek mythology, clear-voiced maidens who guarded the tree bearing golden apples that Gaea gave to Hera at her marriage to Zeus. According to Hesiod, they were the daughters of Erebus and Night; in other accounts, their parents were Atlas and Hesperis or Phorcys and Ceto. They were

dame’s rocket, (Hesperis matronalis), herbaceous plant of the mustard family (Brassicaceae). Native to Eurasia, dame’s rocket is often cultivated as an ornamental and has naturalized in North America, where it is now considered an invasive species. The plant is a biennial or short-lived perennial

Hesperornis, (genus Hesperornis), extinct birds found as fossils in Late Cretaceous Period deposits dating from 99.6 million to 65.5 million years ago; this bird is known mostly from the Great Plains region of the United States, but some remains have been found as far north as Alaska. Hesperornis

Hesperorthis, extinct genus of brachiopods, or lamp shells, which as fossils are especially characteristic of Ordovician marine rocks (438 to 505 million years old). The plano-convex shell of Hesperorthis consists of two units (or valves), the brachial valve being flat and the pedicle valve convex.

Hesperus, in Greco-Roman mythology, the evening star; although initially considered to be the son of Eos (the Dawn) and the Titan Astraeus, he was later said to be the son or brother of Atlas. He was later identified with the morning star, Phosphorus, or Eosphorus (Latin: Lucifer), the bringer of

Hesperus, in Greco-Roman mythology, the evening star; although initially considered to be the son of Eos (the Dawn) and the Titan Astraeus, he was later said to be the son or brother of Atlas. He was later identified with the morning star, Phosphorus, or Eosphorus (Latin: Lucifer), the bringer of