Geschiedenis van de kant van wie het overkwam
Op deze dag — oktober 9
| Year | Country | Category | title |
|---|---|---|---|
| 21 April 899 v.Chr. | China | Astronomy | Modern orbital calculation tests an ancient text |
| 21 April 899 v.Chr. | China | Astronomy | An eclipse record preserves early Chinese astronomy |
| 21 April 899 v.Chr. | China | Astronomy | Chinese observers record the Double-Dawn eclipse |