condition mean min max 4 h after light 569.5 569.5 569.5 8 h after light 523.1 464.0 582.2 12 h after light 418.2 414.4 422.0 4 h after dark 559.5 408.2 710.8 8 h after dark 596.6 568.0 625.2 12 h after dark 573.5 549.6 597.4