Materials Needed

    • A large sheet of paper (11” x 17” will work) or the Shortest Shadow Circle (SSC) downloadable at
    • Compass
    • Level
    • Plummet or plumb bob (optional)
    • Gnomon (Note: a gnomon is the ‘pointer’ on a sundial.) Your gnomon can be a straight stick or an empty tube.  Your gnomon must be able to stand independently and should be set such that is stands vertically. A longer gnomon will result in a more accurate measurement.
    • Pencil or Pen