ers could see them
against an actual sky. Professor Kaufman then took people to a Long Island
hilltop, where he made hundreds of measurements of their perceptions of
the distance to the moon. 
 
Each person was first asked to position an artificial moon so it appeared
to be halfway between themselves and a fixed moon that was either near
the horizon or elevated. In every case, the viewers placed the halfway point
to the horizon moon as being much farther away -- on average four times
more distant -- than the halfway point to the elevated moon. This is
entirely consistent with the apparent-distance theory.
 
 (cont'd)


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