sentence: Surveying provides an everyday example of parallax.
sentences_after: Go outside and look at a distant object. Hold your hand out with one finger raised and close one eye. Then close that eye and open the other without moving your arm. Now, move your finger to block that eye's line of sight. The two positions your finger was at  can be used to find the distance from the object.
concept_name: surveying
headings: Parsec
categories: Astronomical distances Units of length