| Year | 1972 |
| Date | 21-Jul |
| Volume | 138 |
| Issue | 3,445 |
| Page | 705 |
| Category | Correction |
| Part | |
| Title | Making a Sundial |
| Author | B.J.Smith |
| Notes | Purpose and description, choice of design, latitude correction, longitude correction, equation of time correction, construction |