De la grandeur et de la figure de la terre

De la grandeur et de la figure de la terre (Concerning the Size and Shape of the Earth) is a work by Jacques Cassini, published in 1720. In this book, Cassini supported the theory that the Earth is an elongated sphere, rather than flattened at the poles. This was in contrast to the Newtonian view, which suggested the Earth is flattened at the poles. Cassini's measurements and conclusions were later challenged by expeditions sent to Peru and Lapland, which provided evidence supporting the flattened Earth theory. His son, César-François Cassini de Thury, continued surveying work and began the construction of a great topographical map of France.123