Robert Shirley, 6th Earl Ferrers (20 July 1723 – 18 April 1787) was a British Hereditary peer.
| A Philosopher Lecturing on the Orrery | |
|---|---|
 | |
| Artist | Joseph Wright of Derby |
| Year | c. 1766[citation needed] |
| Medium | Oil on canvas[citation needed] |
| Dimensions | 1473 mm × 2032 mm (58 in × 80 in) |
| Location | Derby Museum and Art Gallery[citation needed], Derby, England |