condition mean min max 4 h after light 9.3972075 9.005428 9.788987 8 h after light 9.341807 8.948263 9.735351 12 h after light 9.7269755 9.629491 9.82446 4 h after dark 7.814415 7.696419 7.932411 8 h after dark 8.948263 8.948263 8.948263 12 h after dark 8.948263 8.948263 8.948263