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3.1 - For Your Local Definition Of "Down"

A Podcast Of Unnecessary Detail

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Defining the Prime Meridian

This chapter explores the concept of latitude and longitude and the challenges in defining the zero point for longitude. The speaker shares their experience visiting the Greenwich observatory and discusses the history of how astronomers determined the prime meridian. They also discuss the impact of local gravity on defining vertical directions and the need for a shift to ensure compatibility between old and new systems.

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