The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A280189

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A280189

Version of sexagesimal expansion of sine of one degree given by the Persian mathematician Al-Kashi in the 15th Century.
(history; published version)

#13 by N. J. A. Sloane at Fri Jan 13 19:58:54 EST 2017

STATUS

proposed

approved

#12 by Jon E. Schoenfield at Fri Jan 13 19:57:34 EST 2017

STATUS

editing

proposed

#11 by Jon E. Schoenfield at Fri Jan 13 19:55:49 EST 2017

KEYWORD

nonn,base,cons,morefini,full

STATUS

approved

editing

Discussion

Fri Jan 13

19:57

Jon E. Schoenfield: This sequence is finite and full, isn't it?  I.e., it's not about the exact value of sine(1°), but rather a list of the sexagesimal places calculated in the 15th Century, right?

#10 by N. J. A. Sloane at Wed Dec 28 19:57:20 EST 2016

STATUS

proposed

approved

#9 by Mohammad K. Azarian at Wed Dec 28 18:55:15 EST 2016

STATUS

editing

proposed

#8 by Mohammad K. Azarian at Wed Dec 28 18:54:48 EST 2016

KEYWORD

nonn,base,cons,more,changed

#7 by Omar E. Pol at Wed Dec 28 18:41:44 EST 2016

STATUS

proposed

editing

#6 by Omar E. Pol at Wed Dec 28 18:41:38 EST 2016

STATUS

editing

proposed

#5 by Omar E. Pol at Wed Dec 28 18:40:21 EST 2016

COMMENTS

The Fifteenth Century Persian fifteenth century persian mathematician Jamshid Al-Kashi was the first to calculate the value of sine of one degree correct to ten sexagesimal places (17 decimal digits) in his Risala al-Watar wa'l Jaib.

LINKS

Mohammad K. Azarian, <a href="http://forumgeom.fau.edu/FG2015volume15/FG201523.pdf"> A Study of Risala al-Watar wa'l Jaib ("The Treatise on the Chord and Sine") </a> , , Forum Geometricorum, Volume 15 (2015) 229-242. Mathematical Reviews, MR 3418854 (Reviewed), Zentralblatt MATH, Zbl 1328.01015.

CROSSREFS

Cf. A019810, A019812, A049469, A110937, A280188.

STATUS

proposed

editing

Discussion

Wed Dec 28

18:41

Omar E. Pol: Minor edits in the link and in Crossrefs section. Please, add the keyword "more", otherwise please add the keywords "fini" and "full".

#4 by Mohammad K. Azarian at Wed Dec 28 17:43:33 EST 2016

STATUS

editing

proposed