| Year | 1987 |
| Date | 06-Feb |
| Volume | 158 |
| Issue | 3,794 |
| Page | 154 |
| Category | Horology |
| Part | 1 |
| Title | The Planetarium of Giovani De Dondi |
| Author | D.J.Unwin |
| Notes | Described his modern replica of the 14th. century astonomical (astronomical?) clock. Description of the clock, an interesting challenge, interesting parts in construction |