Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Displays used in Experiment 1. In the actual displays the lines were black, the ellipses were light green and the background was a medium green. The labels refer to the position of the lower ellipse relative to the height of the ground horizon.
