* Spherical concave and convex mirrors do not focus parallel rays to a single point due to spherical aberration.

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

Vectors can also be expressed in terms of the versors of a Cylindrical coordinate system () or Spherical coordinate system ().

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.

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.

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

Spherical coordinates ( r, θ, φ ) as commonly used in physics: radial distance r, polar angle θ ( theta ), and azimuthal angle φ ( phi ).

Spherical coordinates ( r, θ, φ ) as often used in mathematics: radial distance r, azimuthal angle θ, and polar angle φ.

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

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

Spherical mirror distortion is used in projection systems that utilize a digital video projector and a first surface convex spherical mirror to project images onto a dome.

Spherical equivalent refraction is normally used to determine soft lens power and spherical glasses power.

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 astronomy or positional astronomy is the branch of astronomy that is used to determine the location of objects on the celestial sphere, as seen at a particular date, time, and location on the Earth.

Select this link for an animation of a Spherical deployable mechanism.

Spherical triangle for application of the spherical law of cosines for the calculation the solar zenith angle Θ for observer at latitude φ and longitude λ from knowledge of the hour angle h and solar declination δ.

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 buildings arise in two quite different ways in connection with the affine building X for SL < sub > n </ sub >( Q < sub > p </ sub >):

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

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

Figure 1: Spherical surface in k-space for electrons in three dimensions.

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

As an inventor, Sperling created, with Mike Simmons, the Astroscan telescope for Edmund Scientific, as well as " The Stars Above " star-finder for Spherical Concepts.

** Spherical stone shot for Trebuchets

* Zeroids: Spherical robots that perform ground operations and serve as the firepower for the Spacehawk.

:; Spherical generation: The proper expression for making or turning a shape is to generate as in to generate a form around a fixed axis of revolution.

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.

* Fritz Koenig-Great Spherical Caryatid (" The Sphere "), designed for the World Trade Center, now in Battery Park, NYC

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

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

* 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.

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.

Spherical tokamaks are not limited by the same instabilities as tokamaks and as such the area is receiving considerable experimental attention.

* 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 ".