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Definition:
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This system is a fundamental reference system for most spinning spacecraft since the S/C - Sun meridian can
easily be determined on board using a narrow-slit sun sensor. Thus a spacecraft-fixed instrumental system
has only a longitudinal offset with respect to SAS linear in time.
+Z-axis: spacecraft spin axis vA, right-handed orientation.
+Y-axis: cross-product between +Z-axis and S/C - Sun vector vS.
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