The best-known of his early researches, however, were his efforts to improve telescope lenses and his observations of the planet Saturn.
In 1655 Huygens spent several months in Paris. He attended the informal gatherings of the so-called Montmort Academy, an important precursor of the French Academy of Sciences and, to at least some of its members, reported on his discovery of Titan, the first of Saturn's moons to be observed. He had initially been attracted to Saturn by its apparently anomalous shape, described by Galileo as "three spheres which almost touch each other, which never change their relative positions, and are arranged in a row along the zodiac so that the middle sphere is three times as large as the others." Intrigued by this peculiar shape, Huygens realized that its resolution would depend on constructing improved telescopes, less subject to various aberrations and more capable of producing detailed images.
Upon returning from Paris, Huygens devoted full time to his efforts to construct such improved eyepieces and lens systems, and although he was unsuccessful in his attempts to produce lenses with hyperbolic or elliptical surfaces, he and his elder brother did succeed in figuring and polishing lenses with an accuracy never before attained.
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