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1780 (MDCCLXXX) was a leap year starting on Saturday of the Gregorian calendar and a leap year starting on Wednesday of the Julian calendar, the 1780th year of the Common Era (CE) and Anno Domini (AD) designations, the 780th year of the 2nd millennium, the 80th year of the 18th century, and the 1st year of the 1780s decade. As of the start of 1780, the…
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| 1780 | - Kali Yuga | 4880–4881 | 1.00 | infobox |
| 1780 | - Shaka Samvat | 1701–1702 | 1.00 | infobox |
| 1780 | - Vikram Samvat | 1836–1837 | 1.00 | infobox |
| 1780 | Ab urbe condita | 2533 | 1.00 | infobox |
| 1780 | Armenian calendar | 1229 ԹՎ ՌՄԻԹ | 1.00 | infobox |
| 1780 | Assyrian calendar | 6530 | 1.00 | infobox |
| 1780 | Balinese saka calendar | 1701–1702 | 1.00 | infobox |
| 1780 | Bengali calendar | 1186–1187 | 1.00 | infobox |
| 1780 | Berber calendar | 2730 | 1.00 | infobox |
| 1780 | British Regnal year | 20 Geo. 3 – 21 Geo. 3 | 1.00 | infobox |
| 1780 | Buddhist calendar | 2324 | 1.00 | infobox |
| 1780 | Burmese calendar | 1142 | 1.00 | infobox |
| 1780 | Byzantine calendar | 7288–7289 | 1.00 | infobox |
| 1780 | Chinese calendar | 己亥年 (Earth Pig) 4477 or 4270 — to — 庚子年 (Metal Rat) 4478 or 4271 | 1.00 | infobox |
| 1780 | Coptic calendar | 1496–1497 | 1.00 | infobox |
| 1780 | Discordian calendar | 2946 | 1.00 | infobox |
| 1780 | Ethiopian calendar | 1772–1773 | 1.00 | infobox |
| 1780 | Gregorian calendar | 1780 MDCCLXXX | 1.00 | infobox |
| 1780 | Hebrew calendar | 5540–5541 | 1.00 | infobox |
| 1780 | Holocene calendar | 11780 | 1.00 | infobox |
| 1780 | Igbo calendar | 780–781 | 1.00 | infobox |
| 1780 | Iranian calendar | 1158–1159 | 1.00 | infobox |
| 1780 | Islamic calendar | 1193–1195 | 1.00 | infobox |
| 1780 | Japanese calendar | An'ei 9 (安永9年) | 1.00 | infobox |
| 1780 | Javanese calendar | 1705–1706 | 1.00 | infobox |
| 1780 | Julian calendar | Gregorian minus 11 days | 1.00 | infobox |
| 1780 | Korean calendar | 4113 | 1.00 | infobox |
| 1780 | Minguo calendar | 132 before ROC 民前132年 | 1.00 | infobox |
| 1780 | Nanakshahi calendar | 312 | 1.00 | infobox |
| 1780 | Thai solar calendar | 2322–2323 | 1.00 | infobox |
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