vertex

1. Mathsa. the point opposite the base of a figure b. the point of intersection of two sides of a plane figure or angle c. the point of intersection of a pencil of lines or three or more planes of a solid figure 2. Astronomy a point in the sky towards which a star stream appears to move 3. Anatomy the crown of the head

Vertex

The highest point of a structure; the apex or summit.

Vertex

(religion, spiritualism, and occult)

In geometry, a vertex is the pivot point of an angle. In astrology, the vertex is the point in a horoscope where the prime vertical intersects the ecliptic in the west. The antivertex is the corresponding point in the east. The vertex was discovered/invented by L. Edward Johndro and elaborated upon by Charles Jayne. The point where the vertex falls in a chart is said to be the most fated (i.e., least amenable to conscious choices) part of the horoscope. All major astrological chart-casting software programs allow one to calculate the vertex.

Vertex

the point on the celestial sphere toward which the peculiar motions of stars are predominantly directed. There are two such points, diametrically opposed on the celestial sphere, with the galactic coordinates l = 344°, b -1° and l = 164°, b = 1°.

vertex

[′vər‚teks] (astronomy) The highest point that a celestial body attains. On a great circle, that point that is closest to a pole. (mathematics) For a polygon or polyhedron, any of those finitely many points which together with line segments or plane pieces determine the figure or solid. The common point at which the two sides of an angle intersect. The fixed point through which pass all the elements of a cone or conical surface. An intersection of a conic with one of its axes of symmetry. A member of the set of points that are connected by the edges. Also known as node. For a simplex, one of the finite set of points on which a simplex is based. (optics) One of the points where the surface of a lens intersects the optical axis.

vertex

Every great circle intersects two points, 180° apart. These points are 90° away from the longitude of the vertices. The angle at which the great circle intersects the equator is equal to the co-latitude of the vertices. The purpose of determining position of the vertex is to facilitate calculation of intermediate position along the great circle track between which short rhumb-line courses can be steered. Based on the fact that the great circle track intersects the meridian of the vertex at 90°, Napier's rule can be used to solve the successive right angles to obtain intermediate positions.i. The last fix adapted on the arrival speed segment. Normally, it will be the outer marker of the runway in use. However, it may be the actual threshold or another suitable common point on the approach path for the particular runway configuration.
ii. In astronavigation, the vertex of a great circle is the point at which the great circle is nearest the geographic pole—that is, the point at which it reaches the maximum latitude. Every great circle has two vertices (one in each hemisphere). In the solution of great-circle sailing problems, only the vertex nearest the arc forming the great-circle track is considered.

vertex

A corner point of a triangle or other geometric image. Vertices is the plural form of this term. See vertex shader.

vertex

[ver´teks] the summit or top, especially the top of the head (ver´tex cra´nii).

ver·tex

, pl.

ver·ti·ces

(ver'teks, vĕr'ti-sēz), [TA] 1. The topmost point of the vault of the skull, a landmark in craniometry. 2. obstetrics the portion of the fetal head bounded by the planes of the trachelobregmatic and biparietal diameters, with the posterior fontanel at the apex. [L. whirl, whorl]

vertex

(vûr′tĕks′)n. pl. ver·tices (-tĭ-sēz′) also ver·texes 1. The highest point; the apex or summit: the vertex of a mountain.2. Anatomy a. The highest point of the skull.b. The top of the head.3. In astrology, the highest point reached in the apparent motion of a celestial body.4. Mathematics a. The point at which the sides of an angle intersect.b. The point on a triangle or pyramid opposite to and farthest away from its base.c. A point on a polyhedron common to three or more sides.d. A point of maximal curvature on a parabola or hyperbola.

ver·tex

, pl. vertices (vĕr'teks, -ti-sēz) [TA] 1. The topmost point of the vault of the cranium, a landmark in craniometry. 2. obstetrics The portion of the fetal head bounded by the planes of the trachelobregmatic and biparietal diameters, with the posterior fontanel at the apex. [L. whirl, whorl]

vertex

1. The top of the head. 2. Any apex or highest point on a body structure.

vertex

an area on the head of an insect between the compound eyes.
the top of the head.

vertex

The point where the optical axis intersects a reflecting or refracting surface. In a spectacle lens the back vertex is the point of intersection of the optical axis with the surface nearest to the eye, the other being the front vertex. Plural: vertices.
vertex depth Distance between the posterior pole of a spectacle lens and the plane containing the posterior edge of the lens. The vertex depth s is given by the following formulas = r − Î(r² − y²)where r is the radius of curvature of the surface of the spectacle lens and y is the semi-diameter at the edge of the surface (Fig. V3). Syn. sag. See apical clearance; lens measure.
vertex distance Distance along the line of sight between the apex of the cornea and the posterior surface of a spectacle lens. This distance normally varies between 11 mm and 15 mm. See apical clearance; spectacle plane.
vertex focal length The linear distance separating the principal focal point (focus) of an optical system or lens from the front or back vertices. They are called the front vertex focal length (f_v) and the back vertex focal length (f′_v), respectively. In the case of a biconcave or biconvex lens the front and back vertex focal lengths are equal. In the case of a positive meniscus lens, the back vertex focal length is shorter than the front vertex focal length and vice versa in the case of a negative meniscus lens. See back vertex power; front vertex power.
vertex power See back vertex power; front vertex power.

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Fig. V3 Vertex depth (or sagittal depth) s of a spherical surface (r, radius of curvature; 2y, diameter of the surface)

Table V1 Vertex depths of various spherical surfaces. They also represent the centre thickness of a planoconvex lens with a front surface of radius of curvature r and diameter 2y, with an edge thickness of zero. Index of refraction of the lens 1.49
		lens diameter 2y (mm)
surface power (D)	radius r (mm)	40	50	60	70
1	490	0.41	0.64	0.92	1.25
2	245	0.82	1.28	1.84	2.51
3	163.3	1.23	1.92	2.78	3.79
4	122.5	1.64	2.58	3.73	5.11
5	98	2.06	3.24	4.70	6.46
6	81.7	2.49	3.92	5.71	7.88
7	70	2.92	4.62	6.75	9.38
8	61.3	3.38	5.33	7.85	10.99
9	54.4	3.81	6.08	9.01	12.74
10	49	4.27	6.86	10.26	14.71
12	40.8	5.23	8.55	13.13	19.80
14	35	6.28	10.51	16.97	35.00
16	30.6	7.43	12.94	24.47
18	27.2	8.75	16.45
20	24.5	10.35

Patient discussion about vertex

Q. What could make the top of your head hurt to the touch. I don't have a headache. It just hurts when I touch It only hurts on the left side.A. if it's a deep pain- it might be caused by a trauma to the bode. have you been hurt by something..? if you don't remember - it might be a memory loss from the hit to the head :)
if it's a sort of superficial pain- it might be caused of a wound there. ask someone to have a look and see if there's anything over there. it could even be a tic sitting there...

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Patient discussion about vertex

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Synonyms for vertex

noun top

Synonyms

Synonyms for vertex

noun the highest point

Synonyms

Synonyms for vertex

noun the point of intersection of lines or the point opposite the base of a figure

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noun the highest point (of something)

Synonyms

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