820s ke ngwagasome tšhupamabakeng ya Gregorian wa go thoma ka 1 Pherekgong 820 ya fela ka 31 Manthole 829. Ngwagasome 820s o wela ngwagengkgolo wa 9.
| Ngwagakete: | Ngwagakete1 |
| Mengwagakgolo: | Ngwagakgolo 8 – Ngwagakgolo 9 – Ngwagakgolo 10 |
| Mengwagasome: | 790s 800s 810s – 820s – 830s 840s 850s |
| Mengwaga: | 820 821 822 823 824 825 826 827 828 829 |
| 820s-tšago tswalanya: |