The apparent displacement of an object as it is viewed from two different positions is known as

A. parallax.

B. a parsec.

C. a light-year.

D. an arcsecond.

This phenomenon is known as parallax. The simplest example is this: if you are sitting in the passenger seat, the gas tank needle may appear to read empty. However, if you are the driver, you will see that you are not on empty, but should get some gas.