MIDDLEBURY — The winter solstice, which will mark the longest night of the year when it arrives this weekend, is often a time for ritual, reflection and spiritual investigation — not least because of the rich connections we have with darkness. But the physical darkness at the heart of many of our traditions is slowly going away. “If you’ve never seen a truly dark night sky, don’t wait too long — it’s getting harder and harder,” wrote astrophysicist Kelsey Johnson in The New York Times earlier this year. Sat … (read more)