condition mean min max 4 h after light 9.403587 9.138912 9.668262 8 h after light 9.6129865 8.154719 11.071254 12 h after light 9.279963 9.191043 9.368883 4 h after dark 9.575968 9.524691 9.627245 8 h after dark 9.6313335 9.092144 10.170523 12 h after dark 9.609748 9.609748 9.609748