condition mean min max 4 h after light 7.634131 7.502826 7.765436 8 h after light 7.3612905 7.037566 7.685015 12 h after light 6.9955545 6.775074 7.216035 4 h after dark 7.770171 7.313924 8.226418 8 h after dark 7.4754465 7.209185 7.741708 12 h after dark 8.256045 8.256045 8.256045