Comment by numpad0

A mile is supposed to be (1 / 60 / 360 / Earth.circumferenceOf()), so a 1.5mi radius or 3mi diameter circle is (supposed to be slightly short of) 3/60 or 0.05 degrees on a map.

A yard is just 10% short of a meter, just the same thing for most practical purposes.

(full disclosure: I did look these up)