URL: https://ja.wikipedia.org/wiki/820年
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| 千年紀: | 1千年紀 |
|---|---|
| 世紀: | 8世紀 - 9世紀 - 10世紀 |
| 十年紀: | 800年代 810年代 820年代 830年代 840年代 |
| 年: | 817年 818年 819年 820年 821年 822年 823年 |
820年（820 ねん）は、西暦（ユリウス暦）による、閏年。
注釈
出典
