shadow pin: Meaning and Definition of

shad'ow pin"

Pronunciation: [key]
— Navig. Navig.
  1. a vertical pin set in an azimuth instrument or at the center of a compass card, indicating by the direction of its shadow the azimuth of the sun.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.