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The 18th century
723 inventions and discoveries
| Invention or discovery | Date | Inventor or discoverer | Type |
|---|---|---|---|
| NGC 3657 | April 12, 1789 | William Herschel | intermediate spiral galaxy |
| NGC 4026 | April 12, 1789 | William Herschel | lenticular galaxy |
| NGC 3594 | April 14, 1789 | William Herschel | lenticular galaxy |
| NGC 3656 | April 14, 1789 | William Herschel | lenticular galaxy |
| NGC 3733 | April 14, 1789 | William Herschel | intermediate spiral galaxy |
| NGC 3780 | April 14, 1789 | William Herschel | spiral galaxy |
| NGC 3824 | April 14, 1789 | William Herschel | spiral galaxy |
| NGC 3850 | April 14, 1789 | William Herschel | spiral galaxy |
| NGC 3888 | April 14, 1789 | William Herschel | spiral galaxy |
| NGC 3916 | April 14, 1789 | William Herschel | spiral galaxy |
| NGC 3977 | April 14, 1789 | William Herschel | spiral galaxy |
| NGC 3990 | April 14, 1789 | William Herschel | lenticular galaxy |
| NGC 3998 | April 14, 1789 | William Herschel | lenticular galaxy |
| NGC 4172 | April 14, 1789 | William Herschel | spiral galaxy |
| NGC 4198 | April 14, 1789 | William Herschel | lenticular galaxy |
| NGC 4675 | April 14, 1789 | William Herschel | radio galaxy |
| NGC 4686 | April 14, 1789 | William Herschel | spiral galaxy |
| NGC 3398 | April 17, 1789 | William Herschel | spiral galaxy |
| NGC 3448 | April 17, 1789 | William Herschel | irregular galaxy |
| NGC 3499 | April 17, 1789 | William Herschel | lenticular galaxy |
| NGC 4141 | April 17, 1789 | William Herschel | spiral galaxy |
| NGC 4195 | April 17, 1789 | William Herschel | low-surface-brightness galaxy |
| NGC 4271 | April 17, 1789 | William Herschel | lenticular galaxy |
| NGC 4284 | April 17, 1789 | William Herschel | spiral galaxy |
| NGC 4290 | April 17, 1789 | William Herschel | radio galaxy |
| NGC 4358 | April 17, 1789 | William Herschel | lenticular galaxy |
| NGC 4362 | April 17, 1789 | William Herschel | lenticular galaxy |
| NGC 4142 | April 26, 1789 | William Herschel | spiral galaxy |
| NGC 4054-1 | April 28, 1789 | William Herschel | galaxy |
| NGC 4199-1 | April 28, 1789 | William Herschel | galaxy |
| Fantascope | 1790 | Étienne-Gaspard Robert | — |
| NGC 1340 | 1790 | William Herschel | elliptical galaxy |
| 8P/Tuttle | January 9, 1790 | Pierre Méchain | periodic comet |
| NGC 3621 | February 17, 1790 | William Herschel | pure-disc galaxy |
| NGC 2432 | March 4, 1790 | William Herschel | star cluster |
| NGC 2479 | March 4, 1790 | William Herschel | open cluster |
| NGC 2387 | March 10, 1790 | William Herschel | spiral galaxy |
| NGC 2746 | March 10, 1790 | William Herschel | spiral galaxy |
| NGC 2780 | March 10, 1790 | William Herschel | spiral galaxy |
| NGC 2426 | March 17, 1790 | William Herschel | elliptical galaxy |
| NGC 2431 | March 17, 1790 | William Herschel | spiral galaxy |
| NGC 2474 | March 17, 1790 | William Herschel | elliptical galaxy |
| NGC 2693 | March 17, 1790 | William Herschel | elliptical galaxy |
| NGC 2800 | March 17, 1790 | William Herschel | elliptical galaxy |
| NGC 3917 | March 17, 1790 | William Herschel | spiral galaxy |
| NGC 4511 | March 17, 1790 | William Herschel | spiral galaxy |
| NGC 2469 | March 18, 1790 | William Herschel | spiral galaxy |
| NGC 2488 | March 18, 1790 | William Herschel | lenticular galaxy |
| NGC 2497 | March 18, 1790 | William Herschel | lenticular galaxy |
| NGC 2534 | March 18, 1790 | William Herschel | elliptical galaxy |
| NGC 2701 | March 18, 1790 | William Herschel | barred spiral galaxy |
| NGC 2756 | March 18, 1790 | William Herschel | spiral galaxy |
| NGC 3683 | March 18, 1790 | William Herschel | spiral galaxy |
| NGC 3757 | March 18, 1790 | William Herschel | lenticular galaxy |
| NGC 3795 | March 18, 1790 | William Herschel | spiral galaxy |
| NGC 3838 | March 18, 1790 | William Herschel | lenticular galaxy |
| NGC 3895 | March 18, 1790 | William Herschel | spiral galaxy |
| NGC 3963 | March 18, 1790 | William Herschel | spiral galaxy |
| NGC 2726 | March 19, 1790 | William Herschel | spiral galaxy |
| NGC 2742 | March 19, 1790 | William Herschel | spiral galaxy |