condition mean min max 4 h after light 9.516416 9.114478 9.918354 8 h after light 8.948973 8.600284 9.297662 12 h after light 9.5777985 8.502139 10.653458 4 h after dark 9.138912 9.138912 9.138912 8 h after dark 8.4629105 8.28072 8.645101 12 h after dark 9.891912 9.891912 9.891912