八十年
公元八十年者，閏年也，繼七十九年，下八十一年。
| 干支 | 庚辰 |
| 生肖 | 龍 |
| 《民報》軒轅 | 二七七八 |
| 《江蘇》軒轅 | 二五七一 |
| 唐堯 | 二二三六 |
| 共和 | 九二一 |
| 孔曆 | 六三一 |
| 秦曆 | 三〇一 |
| 日本皇紀 | 七四〇 |
| 韓國檀君 | 二四一三 |
| 道曆 | 二七七七 |
| 佛曆 | 六二四 |
大事
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