  The sphericity of the form of the Earth was questioned around the year 1687,
primarily, by Isaac Newton who deduced from his theory of universal gravitation
that the Earth has the form of a spheroid flattened at the poles and elongated
at the equator. In France, somepreeminent geographers were not convinced by
Newton's arguments, and about the same period, based on empirical measurements,
they emitted another theory, claiming that on the contrary, the Earth has the
form of a spheroid flattened at the equator and elongated at the poles. To find
the real figure of the Earth became one of the major questions that were
investigated by geographers, astronomers, mathematicians and other scientists
in the eighteenth century, and the work done around this question had an impact
on the development of all these fields. In this paper, we review the work of
the eighteenth-century French mathematician, astronomer and geographer
Alexis-Claude Clairaut related to the question of the figure of the Earth. We
report on the relation between this work and that of Leonhard Euler. At the
same time, we comment on the impact of the question of the figure of the Earth
on mathematics, astronomy and hydrostatics. Finally, we review some later
mathematical developments that are due to various authors that were motivated
by this question. It is interesting to see how a question on geography had such
an impact on the theoretical sciences. The final version of this paper will
appear in Ganita Bh{\=a}r{\=a}t{\=i}, (Indian Mathematics) the Bulletin of the
Indian Society for History of Mathematics.
