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What is a parsec? Sal's video explains that a parsec is 3.26 light years, and that the word its self can be broken into par = parallax and sec=1 arc second. He uses illustrations, diagrams, and trigonometric equations to help viewers understand how the concept of Parsec works in relation to Astronomical Units or light years. Note: learners will need a solid trigonometry background to fully comprehend Sal's explanation.
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