His most celebrated work was a 5-feet vertical circle, which was finished in 1789 and was used by Giuseppe Piazzi at Palermo in constructing his catalogue of stars.
Giuseppe Garibaldi | Giuseppe Tornatore | Giuseppe Sinopoli | Giuseppe De Santis | Giuseppe Capogrossi | Giuseppe Terragni | Giuseppe Mazzini | Giuseppe Ungaretti | Giuseppe Lignano | Giuseppe Tucci | Giuseppe Radaelli | Giuseppe Pizzardo | Giuseppe Morello | Giuseppe Marchese | Giuseppe Guarneri | Giuseppe Di Cristina | San Giuseppe Jato | Rima San Giuseppe | Giuseppe Valdengo | Giuseppe Tomasi di Lampedusa | Giuseppe Soleri | Giuseppe Sergi | Giuseppe Quaglio | Giuseppe Piazzi | Giuseppe Patroni Griffi | Giuseppe Parini | Giuseppe Mosca | Giuseppe Greco | Giuseppe Giusti | Giuseppe Farina |
On January 1, 1801, Giuseppe Piazzi, Chair of Astronomy at the University of Palermo, Sicily, found a tiny moving object in an orbit with exactly the radius predicted by the Titius–Bode law.