1640
| Ngwagakete: | Ngwagakete 2 |
|---|---|
| Mengwagakgolo: | Ngwagakgolo 16 – Ngwagakgolo 17 – Ngwagakgolo 18 |
| Mengwagasome: | 1610s 1620s 1630s – 1640s – 1650s 1660s 1670s |
| Mengwaga: | 1637 1638 1639 – 1640 – 1641 1642 1643 |
1640 (MDCXL) ebile ngwagamolele wa go thoma ka Sontaga, ngwaga wa pele ngwagengsome wa 1640s, ngwaga wa bomasomenne ngwagengkgolo wa Ngwagakgolo 17, le ngwaga wa bomakgolo tshela masomenne ngwagengkete wa Ngwagakete 2.