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This seems like a prudent approach: Catalog objects and events according to the things we can measure on earth right now, since our direct measurements (calendar dates, spectral lines, etc.) are probably quite accurate, but the inferred distances might change in the future as we improve our overall empirical and theoretical knowledge. With the exception of the timing of an event, we can go back and re-measure the other things if we can at least find the same object later.

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