Others studied the use of spheromaks to inject helicity into tokamaks, eventually leading to the Helicity Injected Spherical Torus ( HIST ) device and similar concepts for a number of existing devices.

Spherical concave backing surfaces support the diaphragm when excessive pressures are applied and prevent the stresses within the diaphragm from exceeding the elastic limit.

Spherical errors occur when errors have both uniform variance ( homoscedasticity ) and are uncorrelated with each other.

Spherical fullerenes are also called buckyballs, and they resemble the balls used in soccer.

Spherical mechanisms are constructed by connecting links with hinged joints such that the axes of each hinge passes through the same point.

Spherical coordinates, projected on the celestial sphere, are analogous to the geographic coordinate system used on the surface of the Earth.

Spherical waves are waves whose amplitude depends only upon the radial distance r from a central point source.

Spherical geometry obeys two of Euclid's postulates: the second postulate (" to produce a finite straight line continuously in a straight line ") and the fourth postulate (" that all right angles are equal to one another ").

Spherical harmonics are often used to approximate the shape of the geoid.

Spherical harmonics are important in many theoretical and practical applications, particularly in the computation of atomic orbital electron configurations, representation of gravitational fields, geoids, and the magnetic fields of planetary bodies and stars, and characterization of the cosmic microwave background radiation.

Spherical mirrors are easier to make than parabolic mirrors and they are often used to produce approximately collimated light.

Spherical codes are higher-dimensional analogues of Tammes problem, which arose as an attempt to explain the distribution of pores on pollen grains.

which regular solutions for positive energies are given by so-called Bessel functions of the first kind ' so that the solutions written for R are the so-called Spherical Bessel function

Spherical coordinates are one of the most used curvilinear coordinate systems in such fields as Earth sciences, cartography, and physics ( in particular quantum mechanics, relativity ), engineering, etc.

Spherical 3-manifolds are sometimes called elliptic 3-manifolds or Clifford-Klein manifolds.

Spherical astronomy is the branch of astronomy that is concerned with where celestial objects are located and how they move on the celestial sphere.

Spherical groups with a radially fibrous structure and bristled with crystals on the surface are not uncommon.

* Simon Newcomb, A Compendium of Spherical Astronomy ( Macmillan, 1906 – republished by Dover, 1960 ), 160-172.

** M. C. Escher used special shapes of mirrors in order to achieve a much more complete view of his surroundings than by direct observation in Hand with Reflecting Sphere ( also known as Self-Portrait in Spherical Mirror ).

* Spherical sector, portion of a sphere enclosed by a cone of radii from the center of the sphere.

* Spherical coordinate system represents a point in three space by the distance from the origin and two angles measured from two reference lines which intersect the origin.

* Spherical segment, is a portion of a sphere cut off by a pair of parallel planes

Spherical trigonometry was studied by early Greek mathematicians such as Menelaus of Alexandria, who wrote a book on spherical trigonometry called Sphaerica and developed Menelaus ' theorem.

* Spherical cap, portion of a sphere cut off by a plane

Spherical triangle solved by the law of haversines.

Spherical triangles were studied by early Greek mathematicians such as Menelaus of Alexandria, who wrote a book on spherical triangles called Sphaerica and developed Menelaus ' theorem.

Spherical triangle solved by the law of cosines.

* Spherical Trigonometry — for the use of colleges and schools by I. Todhunter, M. A., F. R. S.

Spherical mirrors may be used for direction finding by moving the sensor rather than the mirror ; another unusual example is the Arecibo Observatory ; see also

Still Life with Spherical Mirror is a lithography print by the Dutch artist M. C. Escher which was first printed in November, 1934.

Hand with Reflecting Sphere also known as Self-Portrait in Spherical Mirror is a lithograph print by Dutch artist M. C. Escher, first printed in January 1935.

When it was all completed ( in + 725 ) it was called the ' Water-Driven Spherical Bird's-Eye-View Map of the Heavens ( Shui Yun Hun Thien Fu Shih Thu ) or ' Celestial Sphere Model Water-Engine ' and was set up in front of the Wu Chheng Hall ( of the Palace ) to be seen by the multitude of officials.

* William M. Smart, edited by Robin M. Green, Textbook on Spherical Astronomy, 1977, Cambridge University Press, ISBN 0-521-29180-1.

Große Kugelkaryatide ( Great Spherical Caryatid ) by the artist, New Yorkers soon nicknamed it The Sphere.

* A. S. Hardy ( 1887 ) Elements of Quaternions, pp. 71, 2 " Representation of Versors by spherical arcs " and pp. 112 – 8 " Applications to Spherical Trigonometry ".

The first Seidel aberration, Spherical Aberration, is independent of the position of the exit pupil ( as it is the same for axial and extra-axial pencils ).

Spherical triangle groups can be identified with the symmetry groups of regular polyhedra in the three-dimensional Euclidean space: Δ ( 2, 3, 3 ) corresponds to the tetrahedron, Δ ( 2, 3, 4 ) to both the cube and the octahedron ( which have the same symmetry group ), Δ ( 2, 3, 5 ) to both the dodecahedron and the icosahedron.

The complete list of such manifolds is given in the article on Spherical 3-manifolds.

* Quadrilateralized Spherical Cube, a mapping scheme for data collected on a spherical surface, such as a planet

Spherical lenses have a single power in all meridians of the lens, such as + 1. 00 D, or − 2. 50 D.

However, he also published books on mathematical astronomy such as A Treatise on Spherical Astronomy.