Parallax

[Sarah]

The apparent difference in position of a body (as the sun, or astar) as seen from some point on the earth's surface, and as seenfrom some other conventional point, as the earth's center or the sun.Annual parallax, the greatest value of the heliocentric parallax, orthe greatest annual apparent change of place of a body as seen fromthe earth and sun; as, the annual parallax of a fixed star.-- Binocular parallax, the apparent difference in position of anobject as seen separately by one eye, and then by the other, the headremaining unmoved.-- Diurnal, or Geocentric, parallax, the parallax of a body withreference to the earth's center. This is the kind of parallax that isgenerally understood when the term is used without qualification.-- Heliocentric parallax, the parallax of a body with reference tothe sun, or the angle subtended at the body by lines drawn from it tothe earth and sun; as, the heliocentric parallax of a planet.-- Horizontal parallax, the geocentric parallx of a heavenly bodywhen in the horizon, or the angle subtended at the body by theearth's radius.-- Optical parallax, the apparent displacement in position undergoneby an object when viewed by either eye singly. Brande

[Sarah]

The effect that causes you to misjudge a reading due to the angle of viewing.

[Sarah]

Proposing to oneself the attribute of being smart or undeniable witty.

[Monty]

When someone opens a single car [window] and you can hear the wind [vibration].

[The problem] can only be solved by opening another window.

[Kit]

The secret [second moon] that science is [covering up]. You can see it if you look at the moon with one eye, then [close it] and open the other.