1900
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From left to right, top to bottom:
- John Hay, The American Secretary of State who signed the Open Door Policy;
- Max Planck's formulation of Planck's law of black-body radiation in October 1900 layed the foundation for quantum mechanics;
- Paul Villard's discovery of gamma rays in 1900 expanded our knowledge of the universe;
- German and Indian troops during the Battle of Peking (1900) during the Boxer Rebellion;
- Boers at the Battle of Spion Kop in 1900 during the Second Boer War;
- Australians in 1900 voting for the referendum for Australia to be made into one nation;
- The British Labour party was founded on 1900, it would become a significant political force in Britain;
- Destruction after the 1900 Galveston hurricane which would kill 6,000 to 12,000 people, becoming the deadliest natural disaster in American history.
| 1900 by topic |
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| Humanities |
| By country |
| Other topics |
| Lists of leaders |
| Birth and death categories |
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| Establishments and disestablishments categories |
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| Works category |
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| Gregorian calendar | 1900 MCM |
| Ab urbe condita | 2653 |
| Armenian calendar | 1349 ԹՎ ՌՅԽԹ |
| Assyrian calendar | 6650 |
| Baháʼí calendar | 56–57 |
| Balinese saka calendar | 1821–1822 |
| Bengali calendar | 1306–1307 |
| Berber calendar | 2850 |
| British Regnal year | 63 Vict. 1 – 64 Vict. 1 |
| Buddhist calendar | 2444 |
| Burmese calendar | 1262 |
| Byzantine calendar | 7408–7409 |
| Chinese calendar | 己亥年 (Earth Pig) 4597 or 4390 — to — 庚子年 (Metal Rat) 4598 or 4391 |
| Coptic calendar | 1616–1617 |
| Discordian calendar | 3066 |
| Ethiopian calendar | 1892–1893 |
| Hebrew calendar | 5660–5661 |
| Hindu calendars | |
| - Vikram Samvat | 1956–1957 |
| - Shaka Samvat | 1821–1822 |
| - Kali Yuga | 5000–5001 |
| Holocene calendar | 11900 |
| Igbo calendar | 900–901 |
| Iranian calendar | 1278–1279 |
| Islamic calendar | 1317–1318 |
| Japanese calendar | Meiji 33 (明治３３年) |
| Javanese calendar | 1829–1830 |
| Julian calendar | Gregorian minus 12 or 13 days |
| Korean calendar | 4233 |
| Minguo calendar | 12 before ROC 民前12年 |
| Nanakshahi calendar | 432 |
| Thai solar calendar | 2442–2443 |
| Tibetan calendar | 阴土猪年 (female Earth-Pig) 2026 or 1645 or 873 — to — 阳金鼠年 (male Iron-Rat) 2027 or 1646 or 874 |
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1900 (MCM) was an exceptional common year starting on Monday of the Gregorian calendar and a leap year starting on Saturday of the Julian calendar, the 1900th year of the Common Era (CE) and Anno Domini (AD) designations, the 900th year of the 2nd millennium, the 100th and last year of the 19th century, and the 1st year of the 1900s decade. As of the start of 1900, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
As of March 1 (O.S. February 17), when the Julian calendar acknowledged a leap day and the Gregorian calendar did not, the Julian calendar fell one day further behind, bringing the difference to 13 days until February 28 (O.S. February 15), 2100.