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semidiameter
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semidiameter
ˌsemidiˈameter [late L. (Boethius): see semi- 7 b.] The half of a diameter.1551 Recorde Pathw. Knowl. i. Defin., Diameters, whose halfe, I meane from the center to the circumference any waie, is called the semidiameter, or halfe diameter. 1625 N. Carpenter Geogr. Del. i. v. (1635) 117 Astronomers me...
Oxford English Dictionary
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Semidiameter
In geometry, the semidiameter or semi-diameter of a set of points may be one half of its diameter; or, sometimes, one half of its extent along a particular
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Backstaff
Since the shadow's edge represents the limb of the sun, he must correct the value for the semidiameter of the sun.
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Radius
See also
Bend radius
Filling radius in Riemannian geometry
Radius of convergence
Radius of convexity
Radius of curvature
Radius of gyration
Semidiameter
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transformate
† transˈformate, ppl. a. Obs. rare. [ad. L. transformāt-us, pa. pple. of transformāre to transform.] = transformed.1571 Digges Pantom. iv. Hh iij b, Then is the superficial capacitie of the transformed Octaedrons Hexagonal playnes, equal to the whole superficies of Tetraedron transformate. Ibid. Ii ...
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semi-conjugate
semi-ˈconjugate, a. (n.) Math. [semi- 7 b.] semi-conjugate axis, semi-conjugate diameter = conjugate semiaxis, semidiameter: see conjugate a. 6 a, and cf. quot. 1680 there, and 1885 s.v. semi-diameter. Also ellipt. (as n.) for these.1743 Emerson Fluxions 187 Let AD be an Hyperbola, B the Center, BA ...
Oxford English Dictionary
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Lunar distance (navigation)
Since the Moon's apparent size varies with its varying distance from the Earth, almanacs give the Moon's and Sun's semidiameter for each day. Additionally the observed altitudes are cleared of semidiameter.
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polygon
polygon, n. and a. (ˈpɒlɪgən) Also 7 polygone. [ad. L. polygōnum, a. Gr. πολύγωνον, prop. neut. of πολύγωνος adj. polygonal, f. πολυ-, poly- + -γωνος, from stem of γωνία angle. Cf. F. polygone, † poligone (Cotgr. 1611). Used at first in Latin forms polyˈgōnum, polyˈgōnium.] A. n. 1. Geom. a. A figur...
Oxford English Dictionary
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Navigational algorithms
GHA - Greenwich Hour Angle
Dec - Declination
SD - Semidiameter
HP - Horizontal Parallax
s the solution for course and SOG.
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contained
contained, ppl. a. (kənˈteɪnd) [f. contain.] 1. Enclosed, included, etc.; spec. in Geom.; see the verb.c 1440 Promp. Parv. 91 Conteynyd (or within holdyn), contentus. 1545 T. Raynalde Byrth Mankynde 8 The skyn..compassith immedyatly all the contaynyd meate of the egge. 1571 Digges Pantom. iv. v. V i...
Oxford English Dictionary
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Figure of the Earth
More recent results indicate a 70 m difference between the two equatorial major and minor axes of inertia, with the larger semidiameter pointing to 15°
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半径
【半径】bànjìng(1)[radius](2)从圆心或球心到圆周或球面的直线段(3)该直线段的长度(4)[semidiameter]∶在观测者所在地测定的天体可见圆面所张角度的一半
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cornice
▪ I. cornice, n. (ˈkɔːnɪs) Forms: 6– cornice, 7 cornishe, corniche (coronix), 6–8 coronice, 6 coronich (cornix), 6–9 cornish. [The forms cornice, cornishe, were taken immed. from F. and It. equivalents: cf. 16th c. F. cornice, cornise, in Cotgr. cornice, corniche ‘the cornish or brow of a piller or ...
Oxford English Dictionary
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Semi-major and semi-minor axes
The semi-major axis (major semiaxis) is the longest semidiameter or one half of the major axis, and thus runs from the centre, through a focus, and to
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subduct
subduct, v. (səbˈdʌkt) [f. L. subduct-, pa. ppl. stem of subdūcĕre to subduce.] 1. trans. To take away from its place or position, withdraw from use, consideration, influence, etc. Now rare. a. with physical obj.1652–62 Heylin Cosmogr. iii. (1673) 61/1 The three Palestines..being subducted from the ...
Oxford English Dictionary
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