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Published: Jan. 15, 2019, 8:10 p.m.

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This week we talk about Sputnik 1, satellite triangulation, and the Guugu Yimithirr.

We also discuss the GLONASS, BeiDou, and Galileo constellations.

This is a public episode. If you\\u2019d like to discuss this with other subscribers or get access to bonus episodes, visit letsknowthings.substack.com/subscribe'