condition mean min max 4 h after light 8.42253 8.42253 8.42253 8 h after light 7.8865655 7.678327 8.094804 12 h after light 8.303365 8.113579 8.493151 4 h after dark 8.361974 8.301418 8.42253 8 h after dark 9.054589 8.901485 9.207693 12 h after dark 8.534005 8.534005 8.534005