condition mean min max 4 h after light 9.2841425 8.37631 10.191975 8 h after light 9.955711 9.936115 9.975307 12 h after light 9.400969 9.15536 9.646578 4 h after dark 9.405368 9.15536 9.655376 8 h after dark 9.0989445 9.042529 9.15536 12 h after dark 9.635228 9.635228 9.635228