A novel approach to star trails | Astronomy Essentials | EarthSky


http://earthsky.org/astronomy-essentials/christian-sasse-a-novel-approach-to-star-trails?utm_source=EarthSky+News&utm_campaign=fdc5e8b656-EarthSky_News&utm_medium=email&utm_term=0_c643945d79-fdc5e8b656-394525749&mc_cid=fdc5e8b656&mc_eid=01bf9b26c1

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