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The 18th century
723 inventions and discoveries
| Invention or discovery | Date | Inventor or discoverer | Type |
|---|---|---|---|
| NGC 4222 | April 8, 1784 | William Herschel | spiral galaxy |
| NGC 4419 | April 8, 1784 | William Herschel | spiral galaxy |
| NGC 4473 | April 8, 1784 | William Herschel | elliptical galaxy |
| NGC 4474 | April 8, 1784 | William Herschel | lenticular galaxy |
| NGC 4479 | April 8, 1784 | William Herschel | lenticular galaxy |
| NGC 4516 | April 8, 1784 | William Herschel | spiral galaxy |
| NGC 3559 | April 12, 1784 | William Herschel | spiral galaxy |
| NGC 4443 | April 12, 1784 | William Herschel | lenticular galaxy |
| NGC 4478 | April 12, 1784 | William Herschel | elliptical galaxy |
| NGC 4659 | April 12, 1784 | William Herschel | lenticular galaxy |
| NGC 3914 | April 13, 1784 | William Herschel | radio galaxy |
| NGC 3976 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4180 | April 13, 1784 | William Herschel | astrophysical X-ray source |
| NGC 4197 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4215 | April 13, 1784 | William Herschel | lenticular galaxy |
| NGC 4223 | April 13, 1784 | William Herschel | lenticular galaxy |
| NGC 4224 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4246 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4264 | April 13, 1784 | William Herschel | lenticular galaxy |
| NGC 4296 | April 13, 1784 | William Herschel | lenticular galaxy |
| NGC 4326 | April 13, 1784 | William Herschel | intermediate spiral galaxy |
| NGC 4333 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4341 | April 13, 1784 | William Herschel | lenticular galaxy |
| NGC 4342 | April 13, 1784 | William Herschel | lenticular galaxy |
| NGC 4370 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4423 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4532 | April 13, 1784 | William Herschel | galaxy |
| NGC 4588 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4623 | April 13, 1784 | William Herschel | elliptical galaxy |
| NGC 3833 | April 15, 1784 | William Herschel | spiral galaxy |
| NGC 3876 | April 15, 1784 | William Herschel | spiral galaxy |
| NGC 4442 | April 15, 1784 | William Herschel | lenticular galaxy |
| NGC 4598 | April 15, 1784 | William Herschel | lenticular galaxy |
| NGC 3388 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 3681 | April 17, 1784 | William Herschel | spiral galaxy |
| NGC 3684 | April 17, 1784 | John Frederick William Herschel | spiral galaxy |
| NGC 3790 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 3968 | April 17, 1784 | William Herschel | spiral galaxy |
| NGC 4193 | April 17, 1784 | William Herschel | spiral galaxy |
| NGC 4200 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 4425 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 4431 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 4436 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 4440 | April 17, 1784 | William Herschel | spiral galaxy |
| NGC 4454 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 4531 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 4602 | April 17, 1784 | William Herschel | spiral galaxy |
| NGC 4684 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 4691 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 3535 | April 18, 1784 | William Herschel | spiral galaxy |
| NGC 3567-1 | April 24, 1784 | William Herschel | galaxy |
| NGC 680 | September 1784 | William Herschel | elliptical galaxy |
| NGC 1012 | September 11, 1784 | William Herschel | spiral galaxy |
| NGC 108 | September 11, 1784 | William Herschel | lenticular galaxy |
| NGC 315 | September 11, 1784 | William Herschel | elliptical galaxy |
| NGC 1240 | September 12, 1784 | William Herschel | binary star |
| NGC 296 | September 12, 1784 | William Herschel | low-surface-brightness galaxy |
| NGC 379 | September 12, 1784 | William Herschel | lenticular galaxy |
| NGC 380 | September 12, 1784 | William Herschel | elliptical galaxy |
| NGC 420 | September 12, 1784 | William Herschel | lenticular galaxy |