condition mean min max 4 h after light 2722.3 2722.3 2722.3 8 h after light 2320.7 2291.3 2350.1 12 h after light 2123.95 2039.5 2208.4 4 h after dark 1976.45 1890.4 2062.5 8 h after dark 1787.25 1673.1 1901.4 12 h after dark 1925.85 1648.5 2203.2