condition mean min max 4 h after light 1091.4 1091.4 1091.4 8 h after light 866.05 846.3 885.8 12 h after light 995.8 980.4 1011.2 4 h after dark 1052.2 947.5 1156.9 8 h after dark 1068.85 973.7 1164.0 12 h after dark 1186.85 1106.9 1266.8