A generalized coordinate on which the Lagrangian of a system does not depend explicitly. Also known as ignorable coordinate. 
A generalized coordinate on which the Lagrangian of a system does not depend explicitly. Also known as ignorable coordinate. 
Related Terms 
ABSOLUTE ACCURACYThe ability of a navigation or positioning system to define an exact location in relation to a coordinate system. 
INERTIAL ALIGNMENTThe process of orienting the measuring axes of the inertial components of inertial navigation equipment with respect to the coordinate system in which the equipment is to be used. inertia 
CORIOLIS CORRECTION

APPARENT FORCEA force introduced in a relative coordinate system in order that Newton's laws be satisfied in the system; examples are the Coriolis force and the centrifugal force incorporated in gravity. 
CENTEROFMASS COORDINATE SYSTEMA reference frame which moves with the velocity of the center of mass, so that the center of mass is at rest in this system, and the total momentum of the system is zero. Also known as center of momentum coordinate system. 
COORDINATE CONVERSIONChanging the coordinate system to those of another 
COORDINATEOne of a set of magnitudes defining a point in space. If the point is known to be on a given line, only one coordinate is needed; if on a surface, two are required; if in space, three. Cartesian coordinates define a point relative to two intersecting lines, called AXES. If the axes are perpendicular, the coordinates are rectangular; if not perpendicular, they are oblique coordinates. A three dimensional system of Cartesian coordinates is called space coordinates. Polar coordinates define a point by its distance and direction from a fixed point called the POLE. Direction is given as the angle between a reference radius vector and a radius vector to the point. If three dimensions are involved, two angles are used to locate the radius vector. Spacepolar coordinates define a point on the surface of a sphere by (1) its distance from a fixed point at the center, called the POLE (2) the COLATITUDE or angle between the POLAR AXIS (a reference line through the pole) and the RADIUS VECTOR (a straight line connecting the pole and the point) and (3) the LONGITUDE or angle between a reference plane through the polar axis and a plane through the radius vector and the polar axis. Spherical coordinates define a point on a sphere or spheroid by its angular distances from a primary great circle and from a reference secondary great circle. Geographical or terrestrial coordinates define a point on the surface of the earth. Celestial coordinates define a point on the celestial sphere. The horizon, celestial equator and the ecliptic systems of celestial coordinates are based on the celestial horizon, celestial equator, and the ecliptic, respectively, as the primary great circle. 
INERTIAL FORCEA force in a given coordinate system arising from the inertia of a mass moving with respect to another coordinate system. 
CORIOLIS ACCELERATIONAn acceleration of a body in motion in a relative (moving) coordinate system. The total acceleration of the body, as measured in an inertial coordinate system, may be expressed as the sum of the acceleration within the relative system, the acceleration of the relative system itself, and the Corioli 
EARTHFIXED COORDINATE SYSTEMAny coordinate system in which the axes are stationary with respect to the earth. 
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