condition mean min max 4 h after light 9.81705 8.4873 11.1468 8 h after light 8.458925 8.37466 8.54319 12 h after light 8.84361 8.10581 9.58141 4 h after dark 9.42635 8.97515 9.71528 8 h after dark 10.329833333333333 10.0768 10.6087 12 h after dark 9.85505 9.49235 10.0379