Definition

A unit of distance used in astronomy, equal to about 3.26 light-years, which is based on the apparent shift of stars as seen from different positions in Earth's orbit.

Example

The nearest star to Earth is about 4.24 parsecs away.

Conversation

Did you know that a parsec is actually a unit of distance in space?

Yeah, I heard it’s related to how far stars are from us.

Exactly! It's about 3.26 light-years, which is mind-blowing.

Right? It makes you realize how vast the universe really is!

Synonyms & Antonyms

Root Explanation

**Parsec** → It is formed from "parallax" (from Greek *parallaxis*, meaning alteration) and "second" (from Latin *secundus*, meaning second). The word "parsec" refers to the distance at which one astronomical unit subtends an angle of one arcsecond, combining the concepts of distance and angular measurement.

Memory Tip

Think of 'parallax' which relates to the change in position and 'second' which indicates a specific measurement of time or angle — together, they help you remember that a parsec is a unit of distance based on angular measurement.

Visually Confused Words