CIRCLE WITH A DOT

@DavidBridger id read it. Depending on what collapsed in society, was there enough of a shift in atmospheric conditions that sextant usage is impacted? I am *not* a sailor, but I believe sextant readings can be impacted by pollution, temperature, and air density (since all three affect refraction and *may* influence where the stellar body you’re shooting appears to be). Long distance navigation accuracy may have been affected by whatever happened in centuries past - not an insurmountable problem (I expect people would have figured out the new normal) but maybe old paper charts and logs don’t quite take you where they once did. Or the upper atmosphere is still in such flux that bubbles of misdirection swirl in difficult to predict patterns, forcing folk to consider wind and tides and nav timelines when planning journeys.