condition mean min max 4 h after light 9.294683 7.760299 10.829067 8 h after light 9.483114 9.138912 9.827316 12 h after light 9.552608 9.432932 9.672284 4 h after dark 7.082611 6.251963 7.913259 8 h after dark 7.120065 6.568243 7.671887 12 h after dark 7.640516 7.640516 7.640516