condition mean min max 4 h after light 1820.5 1820.5 1820.5 8 h after light 2044.1 1865.8 2222.4 12 h after light 2500.95 2371.0 2630.9 4 h after dark 2078.85 1301.8 2855.9 8 h after dark 1415.15 1267.7 1562.6 12 h after dark 1735.4 1598.7 1872.1