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Platform Mode
In This attitude control mode is used to maintain spacecraft attitude, in all three axes, with respect to the inertial platform. Spacecraft attitude is held automatically to within 1.1 degrees of the platform attitude. A horizontal attitude, with respect to the earth, can be held if the inertial platform is in the orbit rate or alignment mode of operation. Spacecraft attitude rates are dampened to within + 0.5 degrees/second. The primary purpose of this mode is to automatically hold an inertial spacecraft attitude. This mode is also useful for maintaining spacecraft attitude during fine alignment of the platform.