As a follow up to the Kahn Academy video on parallax, this video focuses on parallax as it relates to astronomical distance. Sal uses cardinal directions and the seasons to orient students in the proverbial night sky. After providing a context he connects parallax to the trigonometric equations necessary to determine a stellar distance. A background in trigonometry would be helpful to comprehend the application of parallax.

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BY-NC-SA: 3.0

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