condition mean min max 4 h after light 7.559303333333333 7.399439999999999 7.65263 8 h after light 6.98103 6.753439999999999 7.27775 12 h after light 6.97955 6.84727 7.216639999999999 4 h after dark 6.742616666666667 6.635210000000001 6.831119999999999 8 h after dark 7.12959 6.946680000000001 7.2309600000000005 12 h after dark 7.667883333333333 7.4459100000000005 8.01472