condition mean min max 4 h after light 7.139065 6.05862 8.21951 8 h after light 6.88095 6.84971 6.91219 12 h after light 8.90396 8.83042 8.9775 4 h after dark 6.60798 6.31019 6.90577 8 h after dark 7.3276900000000005 7.31576 7.33962 12 h after dark 7.35654 7.01446 7.69862