condition mean min max 4 h after light 1309.4 1309.4 1309.4 8 h after light 1115.9 1048.3 1183.5 12 h after light 831.8 815.8 847.8 4 h after dark 762.75 758.3 767.2 8 h after dark 645.0999999999999 571.8 718.4 12 h after dark 803.95 662.8 945.1