condition mean min max 4 h after light 10.19866 10.19866 10.19866 8 h after light 9.6778795 9.141389 10.21437 12 h after light 9.262684 8.367826 10.157542 4 h after dark 9.8130445 9.232618 10.393471 8 h after dark 10.695881 10.21437 11.177392 12 h after dark 11.878545 11.878545 11.878545