| Year | 1987 |
| Date | 06-Mar |
| Volume | 158 |
| Issue | 3,796 |
| Page | 264 |
| Category | Horology |
| Part | 2 |
| Title | The Planetarium of Giovani De Dondi |
| Author | D.J.Unwin |
| Notes | Described his modern replica of the 14th. century astronomical clock. The great wheel and the circle of the year, making gear wheels |