condition mean min max 4 h after light 8.19798 8.08457 8.31139 8 h after light 6.4193 5.87484 6.96376 12 h after light 5.9643 5.74322 6.18538 4 h after dark 8.425595 7.89322 8.95797 8 h after dark 9.13431 9.03085 9.23777 12 h after dark 9.00608 8.62342 9.38874