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vernier thrusters
A vernier thruster is a rocket engine used on a spacecraft for fine adjustments to the direction, attitude or velocity of the vehicle. Depending on the design of a craft's maneuvering and stability systems, it may simply be a smaller thruster complementing the main propulsion system, it may complement larger attitude control thrusters or be a part of the main reaction control system.
The name is derived from vernier calipers (named after mathematician Pierre Vernier) which have a primary scale for gross measurements and a secondary scale for fine measurements.
