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What are quaternions and how are they used in spacecraft dynamics? Background Newtonian mechanics says we live in a universe with three spatial dimensions, and a universal time that is the independent variable, in which we can describe translation and rotation. Relativity theory says we live in a universe with three space-like dimensions and one time-like ...


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It's not clear from the documentation what the four parameters of quaternion represent explicitly -- specifically, whether w is the real part. From my experience, NASA likes to specify quaternions with the real part first, so you may move quaternion.w to USLAB000018 and shift the remaining three accordingly. ISS also reports its Tait-Bryan angles in Yaw-...


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