condition mean min max 4 h after light 9006.3 9006.3 9006.3 8 h after light 8579.2 7521.8 9636.6 12 h after light 9725.05 8598.9 10851.2 4 h after dark 8866.95 8620.3 9113.6 8 h after dark 7886.65 7064.0 8709.3 12 h after dark 7689.5 7605.3 7773.7