condition mean min max 4 h after light 6.953835 6.82193 7.08574 8 h after light 7.3725950000000005 6.50341 8.24178 12 h after light 10.093925 8.00215 12.1857 4 h after dark 17.98143333333333 17.1368 18.9289 8 h after dark 11.940266666666666 11.3689 12.4892 12 h after dark 16.1186 14.352 18.8019