Talk:Al-Battani

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[edit] He was not a Muslim

Apart from his name, which contains ALLAH and MUHAMMAD, the text of his book "Azzij" is available in Arabic at www.alwaraq.com. The book contains multiple quotes from the Quran and Hadith in addition to the usual Shahadah at the start of chapter 1. These distinctive writing features unequivocally affirm that he was Muslim.

Nonsense He was a sabian.--Astriolok 01:49, 14 February 2006 (UTC)

[edit] references in Wikipedia

en: Links to Al Battani
de: Links to de:Muhammad Ibn Dschubair al-Battani
ms: Links to ms:Abu Abdullah Al-Battani

es: Links to es:Al-Batani

de: de:Jonathan Archer#Captain Kathryn Janeway ... U.S.S. Al-Batani ... Regards Gangleri 16:54, 2004 Oct 18 (UTC)

[edit] Something is wrong

Hello I think, this formula

$\sin a = \frac{a}{\sqrt{1 + a^2}}$

is wrong.

The good version is this one (4 September 2005)

or this one :

He also solved the equation sin x = a cos x discovering the formula:

$\sin x =a \cos x \Leftrightarrow \sin x = \frac{a}{\sqrt{1 + a^2}}$

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