980
Houghton Mifflin Guide to Science & Technology:
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In the year 980
Mathematics
Abu'l Wafa al Buzjani (a.k.a. Abu'l-Wefa) [b. Buzjan (Iran), June 10, 940, d. Baghdad (Iraq), July 15, 998] introduces the tangent ratio to Arabic mathematics and further develops spherical trigonometry, basing his work more on Indian trigonometry than on Greek. He translates Diophantus into Greek. See also 900 Mathematics; 1220 Mathematics.
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This article is about the year 980.
| Millennium: | 1st millennium |
|---|---|
| Centuries: | 9th century – 10th century – 11th century |
| Decades: | 950s 960s 970s – 980s – 990s 1000s 1010s |
| Years: | 977 978 979 – 980 – 981 982 983 |
| 980 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 980 CMLXXX |
| Ab urbe condita | 1733 |
| Armenian calendar | 429 ԹՎ ՆԻԹ |
| Assyrian calendar | 5730 |
| Bahá'í calendar | -864–-863 |
| Bengali calendar | 387 |
| Berber calendar | 1930 |
| English Regnal year | N/A |
| Buddhist calendar | 1524 |
| Burmese calendar | 342 |
| Byzantine calendar | 6488–6489 |
| Chinese calendar | 己卯年十二月十一日 (3616/3676-12-11) — to —
庚辰年十一月廿二日(3617/3677-11-22) |
| Coptic calendar | 696–697 |
| Ethiopian calendar | 972–973 |
| Hebrew calendar | 4740–4741 |
| Hindu calendars | |
| - Vikram Samvat | 1036–1037 |
| - Shaka Samvat | 902–903 |
| - Kali Yuga | 4081–4082 |
| Holocene calendar | 10980 |
| Iranian calendar | 358–359 |
| Islamic calendar | 369–370 |
| Japanese calendar | |
| Julian calendar | 980 CMLXXX |
| Korean calendar | 3313 |
| Minguo calendar | 932 before ROC 民前932年 |
| Thai solar calendar | 1523 |
 |
Wikimedia Commons has media related to: 980 |
Year 980 (CMLXXX) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar.
Events
By place
Europe
- Otto II renounces his claim to Lorraine.
- The Viking ring castle of Trelleborg is constructed in Denmark.
- Foundation by Notger of the Prince-Bishopric of Liège which will remain an independent state inside the Holy Roman Empire for more than 800 years, and where the Walloon language will develop.
- Vladimir I of Kiev starts to rule in Russia.
Asia
- Development of Dari dialect during the royal courts of the Samanids in Central Asia which became the major language of Persia.
- Kamboja rule in Bengal is deposed by resurgent Palas.
- The Zanj Empire is founded by Ali ibn Hasan, succeeding the Kilwa Empire.
Americas
- Topiltzin starts to rule (approximate date).
- Tula, Hidalgo becomes the Toltec capital.
Births
- Olof Skötkonung, king of Sweden 995–1022 (approximate date)
- Avicenna
- Emperor Ichijō of Japan
- Godiva, Countess of Mercia
- Humbert I of Savoy
- Leif Ericson
- Malcolm II of Scotland
- Otto III, Holy Roman Emperor
Deaths
References
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Copyrights:
Houghton Mifflin Guide to Science & Technology
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.
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