(inorganic chemistry) A complex, typically of a transition element, in which the hybridization of the central metal atom utilizes d orbitals from the shell inside that of the outermost occupied shell

azimuthal quantum number

plural of orbital quantum number

plural of inner orbital complex

plural of sidereal orbital period

(aerospace) An elliptical orbit used to transfer between two circular orbits of different radii in the same plane.

(space flight) A lunar-resonant orbit about the Earth with a period of 1/2 that of the Moon's (P/2 is an orbit that is approximately a fortnight long)

(algebra) A theorem which states that for each element of a given set that a given group acts on, there is a natural bijection between the orbit of that element and the cosets of the stabilizer subgroup with respect to that element.

(science fiction) A satellite or space station, found in many different works of science fiction, meant to defend a planet against attack from space.

(of a black hole) Synonym of photon sphere