condition mean min max 4 h after light 1800.669537 1458.254371 2143.084703 8 h after light 1856.4865255 1572.303333 2140.669718 12 h after light 1673.1473925 1522.675711 1823.619074 4 h after dark 1684.4024795 1462.616672 1906.188287 8 h after dark 1939.442441 1852.562841 2026.322041 12 h after dark 1803.49513 1803.49513 1803.49513