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535-536 522, 525 495-497 534-548 539-548 490-494 596

OAO (Orbiting Astronomical Observatory)— Attitude system of Evolution of accuracy requirements Inertia! guidance maneuvers Momentum wheel Onboard computer Reaction wheels Stabilization method Star trackers Sun sensor Oblate spacecraft

OMateness of Earth (See Earth, oblateness) Oblique spherical triangle— Equations for components of Table of general solutions Obliquity of the ecliptic Observability— In least-squares estimators Of state vector elements Observation (as used in state estimation)

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