It took me ages trawling though the works of JD Salinger (admittedly not the most prolific of authors) to find this tale which I now humbly submit for your consideration.
Duke Mu of Chin said to Po Lo: “You are now advanced in years. Is there any member of your family whom I could employ to look for horses in your stead?”
Po Lo replied: “A good horse can be picked out by its general build and appearance. But the superlative horse – one that raises no dust and leaves no tracks – is something evanescent and fleeting, elusive as thin air. The talents of my sons lie on a lower plane altogether; they call tell a good horse when they see one, but they cannot tell a superlative horse. I have a friend, however, one Chin-fang Kao, a hawker of fuel and vegetables, who in things appertaining to horses is nowise my inferior. Pray see him.”
Duke Mu did so, and subsequently dispatched him on the quest for a steed. Three months later, lie returned with the news that lie had found one: “It is now in Shach’iu,”
“What kind of a horse is it?” asked the Duke.
“Oh, it is a dun-colored mare,” was the reply. However, someone being sent to fetch it, the annual turned out to be a coal-black stallion!
Much displeased, the Duke sent for Po Lo. “That friend of yours,” he said, “whom I commissioned to look for a horse, has made a fine mess of it. Why, lie cannot even distinguish a beast’s color or sex! What on earth can he know about horses?”
Po Lo heaved a sigh of satisfaction. “Has he really got as far as that?” he cried. “Ah, then he is worth ten thousand of me put together. There is no comparison between us. What Kao keeps in view is the spiritual mechanism. in making sure of the essential, he forgets the homely details; intent on the inward qualities, he loses sight of the external. He sees what he wants to see, and not what he does not want to see. He looks at the things he ought to look at, and neglects those that need not be looked at. So clever a judge of horses is Kao, that he has it in him to judge something better than horses.”
When the horse arrived, it turned out indeed to be a superlative animal.
be the geographical latutude and longitude of two points (a base “standpoint” and the destination “forepoint”), respectively, and 
their differences and 
the (spherical) angular difference/distance, or central angle, which can be constituted from the spherical law of cosines:
given in radians, is then:
.
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