condition mean min max 4 h after light 9.07457 9.05112 9.10032 8 h after light 9.165356666666668 9.05644 9.31367 12 h after light 9.306140000000001 9.17801 9.48761 4 h after dark 9.353486666666665 9.123669999999999 9.54215 8 h after dark 9.19683 9.02867 9.466439999999999 12 h after dark 9.165666666666667 9.09228 9.27839