condition mean min max 4 h after light 418.9 418.9 418.9 8 h after light 469.45 451.9 487.0 12 h after light 510.35 462.8 557.9 4 h after dark 515.85 482.5 549.2 8 h after dark 546.9000000000001 538.1 555.7 12 h after dark 603.95 577.8 630.1