position vector
91List of letters used in mathematics and science — Some common conventions: * Intensive quantities in physics are usually denoted with minuscules, while extensive are denoted with capital letters. * Most symbols are written in italics. * Vectors are bold. * Sets of numbers are blackboard… …
92True anomaly — In astronomy, the true anomaly u,! (Greek nu, also written heta or f ) is the angle between the direction z s of periapsis and the current position p of an object on its orbit, measured at the focus s of the ellipse (the point around which the… …
93Gauge fixing — Quantum field theory (Feynman diagram) …
94Solar sail — Solar sails (also called light sails or photon sails, especially when they use light sources other than the Sun) are a proposed form of spacecraft propulsion using large membrane mirrors. Radiation pressure is about 10 5 Pa at Earth s distance… …
95Robot kinematics — is the study of the motion (kinematics) of robots. In a kinematic analysis the position, velocity and acceleration of all the links are calculated without considering the forces that cause this motion. The relationship between motion, and the… …
96Objectivity (frame invariance) — The concept of objectivity in science means that qualitative and quantitative descriptions of physical phenomena remain unchanged when the phenomena are observed under a variety of conditions. For example, physical processes (e.g. material… …
97Navigational Algorithms — is a source of information whose purpose is to make available the scientific part of the art of navigation, containing specialized articles and software that implements the various procedures of calculus. The topics covered are: Celestial… …
98Geometric algebra — In mathematical physics, a geometric algebra is a multilinear algebra described technically as a Clifford algebra over a real vector space equipped with a non degenerate quadratic form. Informally, a geometric algebra is a Clifford algebra that… …
99Specific relative angular momentum — In astrodynamics, the specific relative angular momentum of an orbiting body with respect to a central body is the relative angular momentum of the first body per unit mass. Specific relative angular momentum plays a pivotal role in definition of …
100Derivation of the center of mass — The center of mass of an object is a point at which, for the purposes of total force and total linear momentum, the mass of the object can be taken to be concentrated, for a particular configuration of the system at an instant of time. This fact… …
