condition mean min max 4 h after light 8.001169 8.001169 8.001169 8 h after light 8.1286285 6.919623 9.337634 12 h after light 8.2868605 7.923524 8.650197 4 h after dark 8.9319335 8.6363 9.227567 8 h after dark 7.8229355 7.671887 7.973984 12 h after dark 6.90353 6.90353 6.90353