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.
Geographical slant & optical slant matches. On the left observers match geographical slant by setting the comparison so that it looks parallel to the standard. On the right observers match optical slant by setting the angle of regard to the comparison to match the angle of regard to the standard. (Adapted from Sedgwick & Levy, 1985.)
