condition mean min max 4 h after light 1114.5 1114.5 1114.5 8 h after light 1093.45 1063.4 1123.5 12 h after light 1005.5 973.5 1037.5 4 h after dark 1363.25 921.0 1805.5 8 h after dark 1336.4 1250.6 1422.2 12 h after dark 1281.3 1245.3 1317.3