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A comment on Continued G4 (Severe) Geomagnetic Storming Observed. Parent comment

Re:Continued G4 (Severe) Geomagnetic Storming Observed by brandmeyer on Friday September 08, 2017 @06:45PM (#15204498)
For the most part, orientation is measured optically or thermally - with sun sensors, earth sensors, and star trackers.
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