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He wrote his first astronomy notes at 10, and was only fifteen when he published an article in a French specialist magazine.
He observed planets including Mars and Saturn, measuring the rotation period of the latter. He wrote some books popularizing astronomy, and was first president of the Sociedad Astrónomica de España y América. He discovered the periodic comet32P/Comas Solà, and co-discovered the non-periodic comet C/1925 F1 (Shajn-Comas Solà); he also discovered some asteroids. The asteroids 1102 Pepita (from his nickname Pepito) and 1655 Comas Solà are named after him.
In 1907 he claimed to observe limb darkening of Saturn's moon Titan, the first evidence that the body had an atmosphere. He was the director of Fabra Observatory since it was established in 1904.
^Baedeker's Barcelona Peter M. Nahm, Automobile Association (Great Britain) - 1992 "Josep Comas i Solà (1868–1937) Born in Barcelona, Josep Comas i Sola soon made his mark as an astronomer; he was only fifteen when he published an article in a French specialist magazine. "