http://www.gresham.ac.uk/lectures-and-events/how-the-earth-moves

Our spaceship Earth is in constant motion - rotating and revolving as it traverses through space. This is a story of our evolving understanding of the geography of Earth's position in space - a story of parallax, aberration and astrometry that stretches from the ancient Greeks to the most modern satellite, Gaia.

The transcript and downloadable versions of the lecture are available from the Gresham College Website: http://www.gresham.ac.uk/lectures-and-events/how-the-earth-moves

Gresham College has been giving free public lectures since 1597. This tradition continues today with all of our five or so public lectures a week being made available for free download from our website. There are currently over 1,500 lectures free to access or download from the website.
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