Astronomy
Abû al Fadl Ja'far ibn al-Muqtafî is the first Arab known to record sunspots. See also 807 Astronomy; 1611 Astronomy.
840
| Sci & Tech Chronology: In the year 840 |
| Wikipedia: 840 |
| Millennium: | 1st millennium |
|---|---|
| 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 | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 840 DCCCXL |
| Ab urbe condita | 1593 |
| Armenian calendar | 289 ԹՎ ՄՁԹ |
| Bahá'í calendar | -1004 – -1003 |
| Bengali calendar | 247 |
| Berber calendar | 1790 |
| Buddhist calendar | 1384 |
| Burmese calendar | 202 |
| Byzantine calendar | 6348 – 6349 |
| Chinese calendar | 己未年十一月廿三日 (3476/3536-11-23) — to —
庚申年十二月初四日(3477/3537-12-4) |
| 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 | |
| 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.
Asia
- Tang Wu Zong succeeds Tang Wen Zong as emperor of China.
- Kyrgyz in Yenisey region (north) defeat Uyghurs. End of the Uyghur khaganate.
- Ya'qub-i Laith Saffari Is born.
Deaths
- June 20 — Louis the Pious, King of the Franks, Emperor of the Holy Roman Empire (b. 778)
- Emperor Junna of Japan (b. 786)
- Emperor Wenzong of Tang
Other Uses[1]
- In marijuana culture, refers to smoking at approximately double the rate of the average cannabis consumer (Ex: 840 Veteran: "JUST SMOEK WEED TWICE AS HARD!!!!111") (see:4:20)
- In the fictional country of Potopia 8/40 (September 9) is a national holiday, and the most important business of the day is conducted at 8:40
- Has nothing to do with the amount of cannabis being smoked, but rather the intensity of which the substance is consumed
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Learn More
 | Louis the German (in archaeology) |
| hank (textiles) |
| Lothair I (Holy Roman emperor) |
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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 Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "840". Read more |
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