nimsepehr (#), nimkoré (#)
Half of a sphere bounded by a great circle, especially one of the halves into which the earth or the celestial sphere is divided.
From L. hemisphærium, from Gk. hemisphairion, from hemi- "half," (from PIE base *semi-; cf. Skt. sami, L. semi-, O.H.G. sami- "half," and O.E. sam-) + sphaira, → sphere.
Henry Draper system
râžmân-e Henry Draper
Fr.: système de Henry Draper
A catalog of stars in which every star is classified by its stellar spectrum. This system is named for the astronomer Henry Draper, but was cataloged by Annie J. Cannon (225,300 stars), and later extended by Margaret W. Mayall.
Henry Draper (1837-1882), an American pioneer of astronomical spectroscopy who established the observing techniques and program for the work that would bear his name when published, seven years after his early death; → system.
Fr.: méthode de Henyey
A powerful numerical technique to solve the stellar structure equations where the star is sub-divided in a finite number of grid cells for which the local conditions are evaluated and computed from the surface inwards to the center by utilizing a Newton-Raphson solver. Relevant physical quantities are either defined at the cell boundaries or as mean values over the complete cell.
Henyey, L. G.; Forbes, J. E.; Gould, N. L., 1964, ApJ 139, 306; → method.
Fr.: trajet de Henyey
A nearly horizontal path on the → Hertzsprung-Russell diagram that a → pre-main sequence star of small mass follows in an early stage of evolution after leaving the → Hayashi track and before reaching the → main sequence. During this stage the pre-main sequence star remains almost wholly in radiative equilibrium.
After Louis George Henyey (1910-1970), American astronomer. Henyey et al. (1955, PASP 67, 154).
A combining form meaning "seven."
From Gk. hepta "seven;" cognate with L. septem; Pers. haft, as below; Du. zeven, O.H.G. sibun, Ger. sieben, E. seven.
Haft-, from haft "seven;" Mid.Pers. haft; Av. hapta; cf. Skt. sapta; Gk. hepta, L. septem; PIE *septm.
haftbar (#), haftguš (#)
Herbig AeBe star
setâre-ye Herbig-e AeBe (#)
Fr.: étoile de Herbig AeBe
A young → A-type or → B-type star showing → emission lines in its spectrum. Herbig AeBe stars are → pre-main sequence stars of → intermediate mass (→ intermediate-mass star). They are often called the higher mass counterparts of → T Tauri stars.
Fr.: objets Herbig-Haro
A small patch of → nebulosity in a → star-forming region, created when fast-moving → jets of material (with speeds up to about 1000 km per sec) from a newborn star collide with the → interstellar medium.
Herâkles (#), Herkul (#), bar zânu nešasté (#)
An ancient → constellation (right ascension about 17h,
declination 30° north), one of the largest in the sky, which is located between
→ Lyra and → Corona Borealis.
It is traditionally depicted as the hero Hercules in a kneeling position.
There are no very bright stars in Hercules, the brightest one is
→ Rasalgethi, a variable
→ red supergiant of magnitude about 3.5.
Abbreviation: Her; Genitive: Herculis.
L. Hercules, from Gk. Heracles "glory of Hera," the most popular hero of Gk. mythology, son of Zeus and the woman Alcmena, who the god seduced in the shape of her husband Amphitryon, king of Thebes.
Herâkles, as above; Herkul, from Fr. Hercule, as above;
Arabicized name of the constellation:
xuše-ye Herâkles, ~ Herkul
Fr.: amas d'Hercule
A small, irregular → cluster of galaxies with fewer than 100 galaxies in its core. It has no strongly dominant central galaxy and is notable for the high proportion of spirals. It lies some 500 million → light-years away in the constellation → Hercules; also known as Abell 2151.
Fr.: dont on peut hériter, qui peut hériter
1) Passing, or capable of passing, naturally from parent to offspring through the genes:
Blue eyes are hereditary in our family.
Of or relating to → heredity.
The passing on of physical or mental characteristics genetically from one generation to another (OxfordDictionaries.com).
M.E., from M.Fr. hérédité, from O.Fr. eredite "inheritance, legacy," from L. hereditatem (nominative hereditas) "heirship, inheritance," → heritage.
Fr.: dont on peut hériter, qui peut hériter
1) Something inherited at birth, such as personal characteristics,
status, and possessions.
M.E. from M.Fr., from O.Fr. iritage, eritage, heritage "heir; inheritance, ancestral estate, heirloom," from heriter "inherit," from L.L. hereditare, ultimately from L. heres (genitive heredis) "heir, heiress," from PIE root *ghe- "to be empty, left behind" (related Gk. word khera "widow").
Rigan from rig "left, abandoned" (in mordé rig "heritage, effects of a dead person, anything hereditary, heirloom") + noun suffix -an (as in rowzan, rowšan, suzan, rasan, zaqan, hâvan, etc.); ultimately from Proto-Ir. *raic- "to leave, abandon;" cf. Av. raēc- "to leave, let;" Mid.Pers. (+ *pati-) phryz-, Mod.Pers. parhêz, parhiz "to keep away from, abstain, avoid;" Khotanese (+ *fra-) hars- "to be left, remain;" Mod.Pers. rištan "to set at liberty, absolve;" Mid.Pers. (+ *ui-) wirēz-, Mod.Pers. gurēz, goriz, gurēxtan, gorixtan "to flee, run away;" Gk. leipein "to leave;" L. linquere "to leave;" PIE *leikw- "to leave, let" (Cheung 2006).
Of or related to hermeneutics, interpretative; explanatory. Also hermeneutical.
The science or art of → interpretation. Originally the term was limited to the interpretation of the Scriptures, but since the nineteenth century it has developed into a general theory of human understanding through the work of Friedrich Schleiermacher (1768-1834), Wilhelm Dilthey (1833-1911), and others. The comprehension of any written text requires hermeneutics. Many different hermeneutic theorists have proposed many different methodologies.
From Gk. hermeneutikos "interpreting," from hermeneutes "interpreter," from hermeneuein "to interpret," of unknown origin. It was formerly thought to derive from Hermes, the tutelary divinity of speech, writing, and eloquence.
Someone who interprets literary or scriptural texts.
Agent noun from → hermeneutics
Fr.: conjugé hermitien
Math.: The Hermitian conjugate of an m by n matrix A is the n by m matrix A* obtained from A by taking the → transpose and then taking the complex conjugate of each entry. Also called adjoint matrix, conjugate transpose. → Hermitian operator.
Hermitian, named in honor of the Fr. mathematician Charles Hermite (1822-1901), who made important contributions to number theory, quadratic forms, invariant theory, orthogonal polynomials, elliptic functions, and algebra. One of his students was Henri Poincaré; → conjugate.
Fr.: opérateur hermitien
An operator A that satisfies the relation A = A*, where A* is the adjoint of A. → Hermitian conjugate.