They saw the ships move forward in a large half-moon, but could not discern me, who was up to my breast in water.
I saw him try both experiments upon a dog, but could not discern any effect from the former.
He was amazed at the continual noise it made, and the motion of the minute-hand, which he could easily discern; for their sight is much more acute than ours: he asked the opinions of his learned men about it, which were various and remote, as the reader may well imagine without my repeating; although indeed I could not very perfectly understand them.
There are no more uses of "discern" in the book.
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The second picture has more pixels, but the human eye can’t discern the difference.
She prays to discern good from evil in all of its disguises.