ellipticity
61Compression (astronomy) — Compression, in astronomy is the deviation of a heavenly body from the spherical form, called also the ellipticity. It is numerically expressed by the ratio of the differences of the axes to the major axis of the spheroid. The compression or… …
62Lacaille 8760 — Starbox begin name=Lacaille 8760 Starbox observe epoch=J2000 ra=21h 17m 15.3s dec= 38° 52 02 appmag v=6.67 constell=Microscopium Starbox character class=M2 Ve b v=1.41 u b=1.19 variable=Flare star Starbox astrometry radial v=+24.1 prop mo ra=… …
63Equation of the center — The equation of the center, in astronomy and elliptical motion, is equal to the true anomaly minus the mean anomaly, i.e. the difference between the actual angular position in the elliptical orbit and the position the orbiting body would have if… …
64Tolman surface brightness test — A Tolman surface brightness test is a comparison of the surface brightness of galaxies as a function of their redshift (measured as z ). Such a comparison was first proposed in 1930 by Richard C. Tolman as a test of whether the universe is… …
65Fiber laser — A fiber laser or fibre laser is a laser in which the active gain medium is an optical fiber doped with rare earth elements such as erbium, ytterbium, neodymium, dysprosium, praseodymium, and thulium. They are related to doped fiber amplifiers,… …
66Magneto-optic Kerr effect — (MOKE) is one of the magneto optic effects. It describes the changes of light reflected from magnetized media. Several grains of NdFeB with magnetic domains made visible via contrast with a Kerr microscope. Contents …
67Kent distribution — The 5 parameter Fisher Bingham distribution or Kent distribution, named after Ronald Fisher, Christopher Bingham, and John T. Kent, is a probability distribution on the two dimensional unit sphere S^{2}, in Bbb{R}^{3} . It is the analogue on the… …
68Angular eccentricity — In the study of ellipses and related geometry, various parameters in the distortion of a circle into an ellipse are identified and employed: Aspect ratio, flattening and eccentricity. All of these parameters are ultimately trigonometric functions …
69Photoelastic modulator — A photoelastic modulator (PEM) is an optical device used to modulate the polarization of a light source. The photoelastic effect is used to change the birefringence of the optical element in the photoelastic modulator. PEM was first invented by J …
70George H. Bryan — George Hartley Bryan, generally referred to in technical literature as G. H. Bryan, was a professor as University College, Bangor, Wales who is generally credited with developing, in 1911, the modern mathematical theory of the motion of an… …
