[D]rops of water naturally form themselves into figures with a convex surface; […]
1837, William Whewell, “Earliest Stages of Astronomy”, in History of the Inductive Sciences, from the Earliest to the Present Times. […], volume I, London: John W[illiam] Parker, […]; Cambridge, Cambridgeshire: J. and J. J. Deighton, book III (History of Greek Astronomy), section 9 (The Globular Form of the Earth), page 150