condition mean min max 4 h after light 6.037425 5.60528 6.46957 8 h after light 5.79619 5.59961 5.99277 12 h after light 6.297 6.25475 6.33925 4 h after dark 10.4859 10.245 10.7268 8 h after dark 8.675844999999999 8.35151 9.00018 12 h after dark 7.820169999999999 7.56792 8.07242