condition mean min max 4 h after light 9.6573425 9.396331 9.918354 8 h after light 9.627245 9.627245 9.627245 12 h after light 8.921222 8.499098 9.343346 4 h after dark 9.7857335 9.739107 9.83236 8 h after dark 9.538095 9.357535 9.718655 12 h after dark 9.332637 9.332637 9.332637