I just looked at diagrams of the ISS, which uses a control moment gyroscope system.
The module is located in the "Z1 Truss", which is mounted rather closely to the station's center of mass.
Article about the Z1 Truss
http://iss.jaxa.jp/iss/3a/mis_z1truss_e.html
Diagram showing the...
Suppose you have a reaction wheel or a control moment gyroscope on your spacecraft for attitude control. This would be a self contained unit, with 3-axis control. Either device utilizes the conservation of angular momentum, trading angular momentum between the unit and the spaceship frame as...