condition mean min max 4 h after light 8.05548 7.77246 8.3385 8 h after light 8.24057 7.88279 8.59835 12 h after light 9.881045 9.56369 10.1984 4 h after dark 12.77085 12.1289 13.4128 8 h after dark 10.8491 10.7466 10.9516 12 h after dark 10.7198 10.7117 10.7279