2. Varie figure intagliate in rume, che reprcaentano lu perspettiva di Pianetti U71 le proporzione dells loro dislanze at Sole et Ohl terra, pertodtche revolutioni, dirczzioni retrogradationi. Bonon. 1659, fed.
3. Epistolic Astro:ion:ice CU711 tabulis ad Marchion 'Ilitl vasianz insert cc in ejusdcm Malvasite ephemeritlibus. Mutt tinx, 1662. fol.
4. Epistolic de observationibus in D. Pctronii tempi° habilis. Bolton, 1663. fol.
5. Osservatione de eclisse Solaro fatta in Ferrara anno 1664, con una figura intagliata in rallie, the representa ono nuovo method° di 'rover le apparcnze varic che fig net medesimo tempo ire. tutta la terra. Ferrara, 1664. fol.
6. Theoria motes Cowie: anni 1664. Roman, 1665.
7. Lettere astronomiche at Signor Abbate Ottavio Fat conieri sopra it cot:fro:Ito di alcune osservazioni dells co mete dell' anno 1665. Roma:, 1665. fol.
8. Lettere astronomiche sopra l'ombrc de /iiancti Me dicci in Glove. 1665. Rom. rot.
9. QUIllr0 lettere at Signor Abb. Falconicri, sopra In varieta del macchie osservate in Giovc, c loro diurne rc voluzioni can lc Tavole. Rom. 1665. fill.
10. P. Gottigniez et Joann. Dom. Cassini Epistolic dux astronomic a, de digicultatibus circa eclipses in Jove a Mediceis planetis effectas, aliaque noviter in ipso delecta. Bonon. 1665. fol.
11. *Dissertationcs ?stronomice Apologcticx. Bonon. .1665. fol.
12.121nstola ad Gcminianum Montanari de refraction= (desalt:2i method°. Bosun. 1665. fol.
13. Maras circa ascii' proprium revolubilis observa tiones Bononicc habitis. llonon. 1666.
14. Dc Solaribus Hypothesibus ct Refractionibus, tole trcs. Bolton. 1666, fol.
15. Discepeatio apologetica de Maculis Jervis et AThrtis ann. 1666, 1667, ct de conversione Veneris circa axon suam.
16. Ephemerides 13011071iCITSC8 iuiCdTCCOTtln1 siderum. Bolton. 1668.
17. .Spina Celeste, metcora osscrvata anno 1688 in Bologna. Bolton. 1668. fol.
18. Xova ratio inveniendi metrice et directe atogea, excentricitates, et anomalies motes planetarum. Bolton. 1669.
Cassini's tables of Jupiter's' satellites having acciden tally laden into the hands of the celebrated French as tronomer M. Picard, he conceived a high opinion of the
abilities of their author ; and such was the lame which that work acquired, that Louis XIV. was anxious to number him among the members of the French academy. Cassini, however, declined the invitation, which was transmitted to him, unless the consent of his superiors was obtained ; and Pope Clement IX. and the senate of Bologna having yielded to the solicitations of the French king, Cassini was granted leave of absence for six years. In the beginning of the year 1669 he came to Paris, and in the same year he was appointed astronomer royal, and was admitted a pensioner of the academy. When his time of absence was about to expire, the Pope and the senate of Bologna insisted upon his return, On pain of forfeiting all his emoluments and revenues, which he had hitherto here pernutte el tee ( lejoy. ministo Colbert induced hint to remain, and in the ) ear 167 3 was naturalized and entered into the married state.
The completion of the royal observatory in 1670, en abled Cassini to devote himself, without interruption, to practical astronomy. In Seplembe• 1671, he began his laborious career, and during the period of 41 ) ears In. made more observations than was perhaps e% r done b) any individual astronomer. These obser‘ations are re corded in no fewer than 165 memoirs, with which he en riched the Memoirs of the: Academy of Sciences, and they contributed greatly tee extend the science of astro nomy. Cassini made a set of regular obsenations on the equinoxes and solstices, and on the oppositions and conjunctions of the planets. On the 5th of Octo ber 1671, he discovered the fifth satellite of Saturn ; on the 23d December 1672 he discovered the third; and in the mouth of March 1684, he discovered the first and second satellites of the same plane t. lie had the merit also or discovering the rotation of the fifth satellite, the belts of Saturn and Jupiter, the spheroidal figure of Jupiter, the zodiacal light, and he was the first who gave a satisfactory theory of the moon's libra tion.