Planets
| Title | Planets |
| View | Mercury and Venus 42:1820 (2008-003) |
| Series | VI: Yerkes Observatory |
| Description | Conjunction of Mercury and Venus. Photograph taken with the Yerkes Observatory 40-inch refractor telescope (exposure 8 hours, 6 minutes). |
| Subject Terms | Mercury (Planet) | Venus (Planet) | Conjunction | Refracting telescopes | Astronomical photography |
| Photographer | Ross, Frank Elmore, 1874-1960 |
| Photograph Date | 1925-07-10 |
| Physical Format | Glass plate negatives; 24.0 x 19.4 cm |
| Collection | Archival Photographic Files |
| Repository | University of Chicago Library, Special Collections Research Center |
| Image Identifier | apf6-01156 |
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