condition mean min max 4 h after light 12901.2 12901.2 12901.2 8 h after light 14174.45 13726.3 14622.6 12 h after light 14530.15 14297.9 14762.4 4 h after dark 15869.25 13908.6 17829.9 8 h after dark 14636.1 13332.2 15940.0 12 h after dark 14754.35 14671.6 14837.1