astronomy · 7th century · 4 crossings
Brahmasphutasiddhanta
ब्राह्मस्फुटसिद्धान्तBrāhmasphuṭasiddhānta
Brahmagupta's treatise of 628: planetary astronomy, and the first surviving systematic arithmetic of zero and negative numbers. Its school's methods reached Baghdad with an Indian embassy and became the Arabic Sindhind tradition.
The chain
-
Zīj al-Sindhind al-kabīr
translated by al-Fazari and Yaqub ibn Tariq commissioned by al-Mansur in Baghdad
An Indian embassy reached al-Mansur's court in 771 or 773 with an astronomer in its party. The Arabic Sindhind made from his text mixes Indian parameters with Persian and Greek material; the Sanskrit source was probably a sibling text of Brahmagupta's school rather than the Brahmasphutasiddhanta itself.
- Pingree 1970 reconstruction of the lost zij from quoted fragments
- Hockey 2007
-
Zīj al-Sindhind
written by al-Khwarizmi in Baghdad
Al-Khwarizmi's own tables in the Sindhind tradition, drawn up under al-Ma'mun. The Arabic original is lost.
-
revised by Maslama al-Majriti and Ibn al-Saffar in Cordoba
Recomputed for the meridian of Cordoba and the Islamic calendar, around the turn of the millennium. This Andalusi recension is the only form in which al-Khwarizmi's tables survived.
-
translated by Adelard of Bath
Manuscript-dated to 1126, one family precisely to 26 January. The attribution reads 'presumably Adelard': two manuscripts intersperse chapters by Petrus Alfonsi, and a version of the tables is keyed to 1116, suggesting an earlier attempt he revised.
- Mercier 1987 the 1126 dating and the Petrus Alfonsi precursor question
-
-