condition mean min max 4 h after light 8.025115 7.62072 8.42951 8 h after light 10.58182 9.55334 11.6103 12 h after light 14.05075 14.0144 14.0871 4 h after dark 23.8088 21.7768 25.8408 8 h after dark 15.25745 15.0485 15.4664 12 h after dark 11.44985 11.1901 11.7096