3 Nephi 1:19

And it came to pass that there was no darkness in all that night, but it was as light as though it was mid-day. And it came to pass that the sun did rise in the morning again, according to its proper order; and they knew that it was the day that the Lord should be born, because of the sign which had been given.

There was no darkness in all that night, but it was as light as though it was mid-day. The sun did rise in the morning again, according to its proper order. They knew that it was the day the Lord should be born, because of the sign which had been given.

All through that night there was no darkness—it was as bright as midday. When the sun rose the next morning right on schedule, they knew this was the day the Lord would be born, just as the sign had promised.