| Abstract from DBPedia | A trajectory or flight path is the path that an object with mass in motion follows through space as a function of time. In classical mechanics, a trajectory is defined by Hamiltonian mechanics via canonical coordinates; hence, a complete trajectory is defined by position and momentum, simultaneously. The mass might be a projectile or a satellite. For example, it can be an orbit — the path of a planet, asteroid, or comet as it travels around a central mass. In control theory, a trajectory is a time-ordered set of states of a dynamical system (see e.g. Poincaré map). In discrete mathematics, a trajectory is a sequence of values calculated by the iterated application of a mapping to an element of its source.弾道（だんどう）は、銃弾や砲弾が発射された瞬間から弾着する瞬間までに辿る経路の事である。 本項目では自由落下を伴い誘導制御されない弾道についてのみ記述する。 (Source: http://dbpedia.org/resource/Trajectory) |
