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Results tagged with fundamental-astronomy
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user 39503
Questions involving reference frames, time scales, and how they are determined. Not for general Astronomy 101 questions.
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Difference between J2000, FK5 and ICRS coordinate systems? Which one does the Yale Bright St...
FK5 is based on optical observations. ICRS is based on radio data. Radio observations (ironically) are much higher accuracy than optical through the application of long baseline interferometry.
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