Mathematics
Brahmagupta writes Khandakhadyaka, primarily a work concerning astronomy. It also contains a method for interpolation that is used to compute the values of the sine function. See also 628 Mathematics.
665
| Sci & Tech Chronology: In the year 665 |
| Wikipedia: 665 |
| Centuries: | 6th century · 7th century · 8th century |
| Decades: | 630s 640s 650s 660s 670s 680s 690s |
| Years: | 662 663 664 665 666 667 668 |
| 665 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 665 DCLXV |
| Ab urbe condita | 1418 |
| Armenian calendar | 114 ԹՎ ՃԺԴ |
| Bahá'í calendar | -1179 – -1178 |
| Berber calendar | 1615 |
| Buddhist calendar | 1209 |
| Burmese calendar | 27 |
| Byzantine calendar | 6173 – 6174 |
| Chinese calendar | 甲子年十二月初十日 (3301/3361-12-10) — to —
乙丑年十一月十九日(3302/3362-11-19) |
| Coptic calendar | 381 – 382 |
| Ethiopian calendar | 657 – 658 |
| Hebrew calendar | 4425 – 4426 |
| Hindu calendars | |
| - Vikram Samvat | 720 – 721 |
| - Shaka Samvat | 587 – 588 |
| - Kali Yuga | 3766 – 3767 |
| Holocene calendar | 10665 |
| Iranian calendar | 43 – 44 |
| Islamic calendar | 44 – 45 |
| Japanese calendar | |
| Korean calendar | 2998 |
| Thai solar calendar | 1208 |
Events
By place
Europe
- Swithelm is succeeded by Sighere and Sebbi as king(s) of Essex.
- Batbayan succeeds Kubrat in Onoguria.
Asia
- The city of Seongnam is renamed Hansanju.
By topic
Religion
- According to the Annales Cambriae, the Anglo-Saxons convert to Christianity after the Second Battle of Badon.
- Sighere of Essex encourages his subjects to reject Christianity and return to their indigenous religion
Births
Deaths
- April 16 – Fructuosus of Braga
- Brahmagupta, Indian mathematician and astronomer (born 598)
- Li Zhong
- Yu Zhining
- Kubrat
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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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Mentioned in
- Féchíne
- acceleration of free fall
- St Chad
- Year 628 (in Science & Technology)
- Brahmagupta (Scientist)
- Axion International Holdings, Inc. (Public Company)
- Alba Longa (ancient city, Italy)
- Exceptions
- Journalist's [Newsperson's] Privilege
- Limitation
