History from the side of those it happened to
Astronomy
| Date | Country | Category | Title |
|---|---|---|---|
| 4 December 1639 | United Kingdom | Astronomy | Horrocks observes Venus in transit |
| 4 December 1639 | United Kingdom | Astronomy | Crabtree independently sees Venus on the Sun |
| 4 December 1639 | United Kingdom | Astronomy | A predicted transit becomes visible |
| 4 December 1639 | United Kingdom | Astronomy | Venus appears as a small black disk |