廿一年
公元廿一年者，平年也，繼二十年，下廿二年。
| 干支 | 辛巳 |
| 生肖 | 蛇 |
| 《民報》軒轅 | 二七一九 |
| 《江蘇》軒轅 | 二五一二 |
| 唐堯 | 二一七七 |
| 共和 | 八六二 |
| 孔曆 | 五七二 |
| 秦曆 | 二四二 |
| 日本皇紀 | 六八一 |
| 韓國檀君 | 二三五四 |
| 道曆 | 二七一八 |
| 佛曆 | 五六五 |
大事
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歿
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