Jacques-André Mallet (French: [mɑlɛ]); also Mallet-Favre;23 September 1740 – 31 January 1790)was a Genevan mathematicianand astronomer. In 1772, Mallet established and co-financed the first Geneva Observatory, and served as its director until his death in 1790. His research primarily concerned occultations,especially lunar and solar eclipses,sunspots,planetary orbits, and the orbits of the moons of Jupiter.