Planet rotation is 83 days [1]. So no, no perpetual days or nights on Proxima b. [1] http://edition.cnn.com/2016/08/24/health/proxima-b-centauri-rocky-planet-h

Planet rotation is 83 days [1]. So no, no perpetual days or nights on Proxima b. [1] http://edition.cnn.com/2016/08/24/health/proxima-b-centauri-rocky-planet-habitable-zone-neighbor-star/ http://edition.cnn.com/2016/08/24/health/proxima-b-centauri-...