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The 18th century
723 inventions and discoveries
| Invention or discovery | Date | Inventor or discoverer | Type |
|---|---|---|---|
| NGC 2870 | March 19, 1790 | William Herschel | spiral galaxy |
| NGC 3725 | March 19, 1790 | William Herschel | spiral galaxy |
| NGC 3740 | March 19, 1790 | William Herschel | spiral galaxy |
| NGC 3762 | March 19, 1790 | William Herschel | spiral galaxy |
| NGC 3978 | March 19, 1790 | William Herschel | intermediate spiral galaxy |
| NGC 3668 | March 20, 1790 | William Herschel | radio galaxy |
| NGC 4210 | March 20, 1790 | William Herschel | spiral galaxy |
| NGC 4238 | March 20, 1790 | William Herschel | spiral galaxy |
| NGC 4256 | March 20, 1790 | William Herschel | spiral galaxy |
| NGC 4332 | March 20, 1790 | William Herschel | spiral galaxy |
| NGC 4441 | March 20, 1790 | William Herschel | lenticular galaxy |
| NGC 4545 | March 20, 1790 | William Herschel | spiral galaxy |
| NGC 1985 | November 13, 1790 | William Herschel | reflection nebula |
| NGC 194 | December 25, 1790 | William Herschel | elliptical galaxy |
| NGC 200 | December 25, 1790 | William Herschel | spiral galaxy |
| NGC 1348 | December 28, 1790 | William Herschel | open cluster |
| NGC 1513 | December 28, 1790 | William Herschel | star cluster |
| NGC 173 | December 28, 1790 | William Herschel | spiral galaxy |
| NGC 2320 | December 28, 1790 | William Herschel | elliptical galaxy |
| NGC 2322 | December 28, 1790 | William Herschel | spiral galaxy |
| NGC 2332 | December 28, 1790 | William Herschel | lenticular galaxy |
| NGC 3392 | 1791 | William Herschel | elliptical galaxy |
| NGC 2525 | February 23, 1791 | William Herschel | spiral galaxy |
| NGC 4646 | March 24, 1791 | William Herschel | lenticular galaxy |
| NGC 2880 | April 2, 1791 | William Herschel | lenticular galaxy |
| NGC 4566 | April 2, 1791 | William Herschel | spiral galaxy |
| NGC 2814 | April 3, 1791 | William Herschel | spiral galaxy |
| NGC 2820 | April 3, 1791 | William Herschel | spiral galaxy |
| NGC 3394 | April 3, 1791 | William Herschel | spiral galaxy |
| NGC 2289 | February 4, 1793 | William Herschel | lenticular galaxy |
| NGC 2290 | February 4, 1793 | William Herschel | spiral galaxy |
| NGC 2333 | February 4, 1793 | William Herschel | spiral galaxy |
| NGC 2388 | February 4, 1793 | William Herschel | spiral galaxy |
| NGC 2401 | March 8, 1793 | William Herschel | star cluster |
| NGC 2425 | March 8, 1793 | William Herschel | star cluster |
| NGC 2578 | March 8, 1793 | William Herschel | lenticular galaxy |
| NGC 3622 | April 6, 1793 | William Herschel | spiral galaxy |
| NGC 4034 | April 6, 1793 | William Herschel | elliptical galaxy |
| NGC 4120 | April 6, 1793 | William Herschel | spiral galaxy |
| NGC 3961 | April 7, 1793 | William Herschel | spiral galaxy |
| NGC 3182 | April 8, 1793 | William Herschel | lenticular galaxy |
| NGC 3206 | April 8, 1793 | William Herschel | spiral galaxy |
| NGC 3220 | April 8, 1793 | William Herschel | spiral galaxy |
| NGC 3238 | April 8, 1793 | William Herschel | lenticular galaxy |
| NGC 3286 | April 8, 1793 | William Herschel | elliptical galaxy |
| NGC 3408 | April 8, 1793 | William Herschel | radio galaxy |
| NGC 3440 | April 8, 1793 | William Herschel | spiral galaxy |
| NGC 3488 | April 8, 1793 | William Herschel | spiral galaxy |
| NGC 3517-1 | April 8, 1793 | William Herschel | spiral galaxy |
| NGC 3530 | April 8, 1793 | William Herschel | lenticular galaxy |
| NGC 3613 | April 8, 1793 | William Herschel | elliptical galaxy |
| NGC 3674 | April 8, 1793 | William Herschel | lenticular galaxy |
| NGC 3407 | April 9, 1793 | William Herschel | lenticular galaxy |
| NGC 3435 | April 9, 1793 | William Herschel | spiral galaxy |
| NGC 3470 | April 9, 1793 | William Herschel | spiral galaxy |
| NGC 3671 | April 9, 1793 | William Herschel | lenticular galaxy |
| Quadrans Muralis | 1795 | Jérôme Lalande | former constellation |
| Smallpox vaccine | 1798 | Edward Jenner | vaccine type |
| NGC 1634 | December 9, 1798 | William Herschel | elliptical galaxy |
| NGC 1284 | December 10, 1798 | William Herschel | lenticular galaxy |