Giovanni Schiaparelli discovers the asteroid 69 Hesperia…
April 1861 CE
He studied at the University of Turin, graduating in 1854, and later did research at Berlin Observatory, under Encke.
In 1859–1860 he worked in Pulkovo Observatory near St Petersburg, and then worked for over forty years at Brera Observatory in Milan.
He is also a senator of the Kingdom of Italy, a member of the Accademia dei Lincei, the Accademia delle Scienze di Torino and the Regio Istituto Lombardo, and is particularly known for his studies of Mars.
An observer of objects in the Solar System, Schiaparelli works on binary stars, discoversthe large main-belt asteroid 69 Hesperia, and demonstrates that the meteor showers are associated with comets.
He proves, for example, that the orbit of the Leonid meteor shower coincides with that of the comet Tempel-Tuttle.
These observations lead the astronomer to formulate the hypothesis, subsequently proved to be correct, that the meteor showers could be the trails of comets.
He is also a keen observer of the inner planets Mercury and Venus.
He makes several drawings and determines their rotation periods.
In 1965, it will be shown that his and most other subsequent measurements of Mercury's period were incorrect.
Schiaparelli is a scholar of the history of classical astronomy.
He is the first to realize that the concentric spheres of Eudoxus of Cnidus and Callippus, unlike those used by many astronomers of later times, are not to be taken as material objects, but only as part of an algorithm similar to the modern Fourier series.