condition mean min max 4 h after light 8.3152695 8.066203 8.564336 8 h after light 8.535217 8.480809 8.589625 12 h after light 7.894366 7.64362 8.145112 4 h after dark 8.412019 8.250177 8.573861 8 h after dark 8.0612215 7.872266 8.250177 12 h after dark 8.419881 8.419881 8.419881