condition mean min max 4 h after light 5.809620000000001 5.40721 6.21203 8 h after light 5.9440550000000005 4.94538 6.94273 12 h after light 6.5516000000000005 5.38242 7.72078 4 h after dark 7.1075566666666665 6.5992 8.00178 8 h after dark 8.092686666666667 6.50291 9.33597 12 h after dark 8.629503333333334 7.96471 9.65389