condition mean min max 4 h after light 9.363081000000001 8.981896 9.744266 8 h after light 9.174199000000002 8.937447 9.410951 12 h after light 9.9427655 9.744266 10.141265 4 h after dark 9.855792000000001 9.831171 9.880413 8 h after dark 9.80808 9.257064 10.359096 12 h after dark 10.318387 10.318387 10.318387