1666
| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
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| Years: |
| 1666 by topic: | |
| Arts and Science | |
| Architecture - Art - Literature - Music - Science | |
| Lists of leaders | |
| State leaders – Colonial & territorial governors – Religious leaders | |
| Birth and death categories | |
| Births - Deaths | |
| Establishments and disestablishments categories | |
| Establishments - Disestablishments | |
| Works category | |
| Works | |
| Gregorian calendar | 1666 MDCLXVI |
| Ab urbe condita | 2419 |
| Armenian calendar | 1115 ԹՎ ՌՃԺԵ |
| Assyrian calendar | 6416 |
| Bengali calendar | 1073 |
| Berber calendar | 2616 |
| English Regnal year | 17 Cha. 2 – 18 Cha. 2 |
| Buddhist calendar | 2210 |
| Burmese calendar | 1028 |
| Byzantine calendar | 7174–7175 |
| Chinese calendar |
乙巳年 (Wood Snake) 4362 or 4302 — to — 丙午年 (Fire Horse) 4363 or 4303 |
| Coptic calendar | 1382–1383 |
| Discordian calendar | 2832 |
| Ethiopian calendar | 1658–1659 |
| Hebrew calendar | 5426–5427 |
| Hindu calendars | |
| - Vikram Samvat | 1722–1723 |
| - Shaka Samvat | 1587–1588 |
| - Kali Yuga | 4766–4767 |
| Holocene calendar | 11666 |
| Igbo calendar | 666–667 |
| Iranian calendar | 1044–1045 |
| Islamic calendar | 1076–1077 |
| Japanese calendar |
Kanbun 5 (寛文５年) |
| Javanese calendar | 1588–1589 |
| Julian calendar | Gregorian minus 10 days |
| Korean calendar | 3999 |
| Minguo calendar | 246 before ROC 民前246年 |
| Nanakshahi calendar | 198 |
| Thai solar calendar | 2208–2209 |
1666 (MDCLXVI) was a common year starting on Friday (dominical letter C) of the Gregorian calendar and a common year starting on Monday (dominical letter G) of the Julian calendar, the 1666th year of the Common Era (CE) and Anno Domini (AD) designations, the 666th year of the 2nd millennium, the 66th year of the 17th century, and the 7th year of the 1660s decade. As of the start of 1666, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923. This is the first year to be designated as an Annus mirabilis, in John Dryden's 1667 poem so titled, celebrating England's failure to be beaten either by the Dutch or by fire. It is the only year to contain each Roman numeral once in descending order (1000(M)+500(D)+100(C)+50(L)+10(X)+5(V)+1(I) = 1666).
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