Sci & Tech Chronology:
In the year
840
Astronomy
Abû al Fadl Ja'far ibn al-Muqtafî is the first Arab known to record sunspots. See also 807 Astronomy; 1611 Astronomy.
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Results for 840
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Wikipedia:
840
| Centuries: | 8th century - 9th century - 10th century |
| Decades: | 810s 820s 830s - 840s - 850s 860s 870s |
| Years: | 837 838 839 - 840 - 841 842 843 |
| 840 by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishments and disestablishments categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 840 DCCCXL |
| Ab urbe condita | 1593 |
| Armenian calendar | 289 ԹՎ ՄՁԹ |
| Bahá'í calendar | -1004 – -1003 |
| Buddhist calendar | 1384 |
| Chinese calendar | 3476/3536-11-23 (己未年十一月廿三日) — to —
3477/3537-12-4(庚申年十二月初四日) |
| Coptic calendar | 556 – 557 |
| Ethiopian calendar | 832 – 833 |
| Hebrew calendar | 4600 – 4601 |
| Hindu calendars | |
| - Vikram Samvat | 895 – 896 |
| - Shaka Samvat | 762 – 763 |
| - Kali Yuga | 3941 – 3942 |
| Holocene calendar | 10840 |
| Iranian calendar | 218 – 219 |
| Islamic calendar | 225 – 226 |
| Japanese calendar | |
| - Imperial Year | Kōki 1500 (皇紀1500年) |
| Julian calendar | 885 |
| Korean calendar | 3173 |
| Thai solar calendar | 1383 |
Events
By Place
Europe
- After the death of Louis the Pious, his sons Lothar, Charles the Bald and Louis the German fight over the division of the Holy Roman Empire, with Lothar succeeding as Emperor.
- Foundation of Dublin by Vikings.
Asia
- Tang Wu Zong succeeds Tang Wen Zong as emperor of China.
Deaths
- June 20 — Louis the Pious, King of the Franks, Emperor of the Holy Roman Empire (b. 778)
- Emperor Junna, Emperor of Japan (b. 786)
- Wiglaf, King of Merciamap-bms:840bpy:মারি ৮৪০new:८४०ksh:Joohr 840
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Copyrights:
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 | Sci & Tech Chronology. History of Science and Technology, edited by Bryan Bunch and Alexander Hellemans. Copyright © 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "840". Read more |
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Keep Reading
Mentioned In:
- Kaiser Lothar I (person)
- Pentium D (technology)
- hank (textiles)
- Springfield: Municipal Government (city, Missouri)
- Louis the German (in archaeology)
- Year 807 (in Science & Technology)
- potassium sulfide (inorganic chemistry)
- Lothair I (Holy Roman emperor)
- Apennines (mountain system)
- Black Volta (river of western Africa)
- Tom (river, Russia)
- Notker (in archaeology)
- partridge
- whale
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