| RefNo | RBO/7/36 |
| AltRefNo | RBO.7.60 |
| Level | Item |
| Title | Copy of a letter from John Wallis to Edmond Halley dated 26 April 1687 at Oxford |
| Date | 1687 |
| Description | Concerning the apparent magnitude of the sun or moon which appear larger at the horizon than when they are higher in the sky - concluded to be an optical illusion |
| Language | English |
| Extent | 5 sides |
| Format | Manuscript |
| Digital images | View item on Science in the Making |
| AccessStatus | Open |
| RelatedMaterial | JBO/8/145 |
Fellows associated with this archive
| Code | PersonName | Dates |
| NA7472 | Wallis; John (1616 - 1703); mathematician and cryptographer | 1616 - 1703 |
| NA8423 | Halley; Edmond (1656 - 1742); astronomer | 1656 - 1742 |