Arcs traced by stars in long or stacked exposures as Earth rotates about 15° per hour.Put it to useStar trail calculatorGuides that use this termAstrophotography Settings Cheat SheetBest Time to Photograph National ParksGhost Town PhotographyKaleidoscope PhotographyStar Trails PhotographyPhotographing Synchronous FirefliesRelated termsSolsticeSQMStar trackerStopSun pathTelephoto compression