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The 18th century
723 inventions and discoveries
| Invention or discovery | Date | Inventor or discoverer | Type |
|---|---|---|---|
| NGC 3649 | February 15, 1784 | William Herschel | spiral galaxy |
| NGC 2234 | February 19, 1784 | William Herschel | open cluster |
| NGC 2236 | February 23, 1784 | William Herschel | open cluster |
| NGC 3640 | February 23, 1784 | William Herschel | elliptical galaxy |
| NGC 4457 | February 23, 1784 | William Herschel | spiral galaxy |
| NGC 4527 | February 23, 1784 | William Herschel | intermediate spiral galaxy |
| NGC 2355 | March 8, 1784 | William Herschel | open cluster |
| NGC 3371 | March 11, 1784 | William Herschel | galaxy |
| NGC 3491 | March 11, 1784 | William Herschel | lenticular galaxy |
| NGC 3524 | March 11, 1784 | William Herschel | lenticular galaxy |
| NGC 3547 | March 11, 1784 | William Herschel | spiral galaxy |
| NGC 3162 | March 12, 1784 | William Herschel | intermediate spiral galaxy |
| NGC 3190 | March 12, 1784 | William Herschel | spiral galaxy |
| NGC 3301 | March 12, 1784 | William Herschel | lenticular galaxy |
| NGC 3437 | March 12, 1784 | William Herschel | spiral galaxy |
| NGC 4529 | March 12, 1784 | William Herschel | spiral galaxy |
| NGC 2672 | March 14, 1784 | William Herschel | elliptical galaxy |
| NGC 3507 | March 14, 1784 | William Herschel | spiral galaxy |
| NGC 3599 | March 14, 1784 | William Herschel | lenticular galaxy |
| NGC 3605 | March 14, 1784 | William Herschel | elliptical galaxy |
| NGC 3608 | March 14, 1784 | William Herschel | elliptical galaxy |
| NGC 3659 | March 14, 1784 | William Herschel | low-surface-brightness galaxy |
| NGC 3686 | March 14, 1784 | William Herschel | spiral galaxy |
| NGC 3691 | March 14, 1784 | William Herschel | low-surface-brightness galaxy |
| NGC 3768 | March 14, 1784 | William Herschel | lenticular galaxy |
| NGC 4344 | March 14, 1784 | William Herschel | lenticular galaxy |
| NGC 2678 | March 15, 1784 | William Herschel | open cluster |
| NGC 3070 | March 15, 1784 | William Herschel | elliptical galaxy |
| NGC 3822 | March 15, 1784 | William Herschel | Seyfert 1 galaxy |
| NGC 3825 | March 15, 1784 | William Herschel | low-ionization nuclear emission-line region |
| NGC 4294 | March 15, 1784 | William Herschel | spiral galaxy |
| NGC 4491 | March 15, 1784 | William Herschel | spiral galaxy |
| NGC 4497 | March 15, 1784 | William Herschel | lenticular galaxy |
| NGC 4528 | March 15, 1784 | William Herschel | lenticular galaxy |
| NGC 4564 | March 15, 1784 | William Herschel | elliptical galaxy |
| NGC 4596 | March 15, 1784 | William Herschel | lenticular galaxy |
| NGC 4608 | March 15, 1784 | William Herschel | lenticular galaxy |
| NGC 2395 | March 16, 1784 | William Herschel | open cluster |
| NGC 2648 | March 19, 1784 | William Herschel | spiral galaxy |
| NGC 2661 | March 19, 1784 | William Herschel | spiral galaxy |
| NGC 3020 | March 19, 1784 | William Herschel | spiral galaxy |
| NGC 3024 | March 19, 1784 | William Herschel | spiral galaxy |
| NGC 3153 | March 19, 1784 | William Herschel | spiral galaxy |
| NGC 3299 | March 19, 1784 | William Herschel | intermediate spiral galaxy |
| NGC 2774 | March 21, 1784 | William Herschel | spiral galaxy |
| NGC 2802 | March 21, 1784 | William Herschel | lenticular galaxy |
| NGC 2803 | March 21, 1784 | William Herschel | lenticular galaxy |
| NGC 3473 | March 21, 1784 | William Herschel | spiral galaxy |
| NGC 4350 | March 21, 1784 | William Herschel | lenticular galaxy |
| NGC 4489 | March 21, 1784 | William Herschel | elliptical galaxy |
| NGC 4502 | March 21, 1784 | William Herschel | spiral galaxy |
| NGC 4515 | March 21, 1784 | William Herschel | spiral galaxy |
| NGC 3412 | April 8, 1784 | William Herschel | lenticular galaxy |
| NGC 3498 | April 8, 1784 | William Herschel | galaxy |
| NGC 3800 | April 8, 1784 | William Herschel | intermediate spiral galaxy |
| NGC 3872 | April 8, 1784 | William Herschel | elliptical galaxy |
| NGC 4037 | April 8, 1784 | William Herschel | spiral galaxy |
| NGC 4168 | April 8, 1784 | William Herschel | elliptical galaxy |
| NGC 4189 | April 8, 1784 | William Herschel | intermediate spiral galaxy |
| NGC 4208 | April 8, 1784 | William Herschel | Magellanic spiral |