NASA | Looking Down a Well: A Brief History of Geodesy

The video explores the evolution of geodesy, starting with Eratosthenes' method of measuring Earth's circumference using shadows and distances between cities. It highlights the development of geodesy through triangulation, mapping, and the realization that Earth is not a perfect sphere. The video also discusses the role of technology, such as radio telescopes and satellites, in advancing geodesy, allowing for precise measurements of Earth's crust, gravity, and ocean tides. Geodesy has had a significant impact on navigation, exploration, and understanding Earth's dynamics, from ancient times to the present.

What method did Eratosthenes use to measure the Earth's circumference?

How did geodesy contribute to the creation of detailed maps?

What practical uses have been derived from the science of geodesy?

What advancements in technology improved geodesy in modern times?

In what ways can satellites be used in geodesy?