Astronomy of Copernicus and its Background by O. Gingerich, J. Dobrzycki (eds.)

By O. Gingerich, J. Dobrzycki (eds.)

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On al-Fargliani see note 4 above. Hifl treatise on the astrolabe and associated tables exist in numerous sources and were widely known in the Islamic Middle Ages, but have never been studied in modern times. Fig. 8. Extract from sl-F a r g h a n i’s astrolabe tables, taken from MS Berlin Ahlwardt 5790 ( = Land berg 50, fols. 3fiv —36r). These two subtables display the position and size oi the almucantar circles corresponding to each degree of altitude for astrolabe plates intended to serve latitudes 20° and 21°.

Fr- ^ |V > ,r Ijx . ^ . #. ^* y*■ja*£1*>\}-uu~ \ s* f*-> ^* M LjL& Jb^'*' £ i* * 1 1 iSj, li) ^ L^ £■ -W- ^ > V t a t >**-H' r j j '~r-p i ^-Ju A. j ; */ 1-r| iw J | t j >-JT^ «:f I- [|^> j ^ 1 |" £]£>& Fig. 6. Extract frfim al-K h a lili’* qibla tuble, t^iken fro re MS Paris Bibliol-hfeque Nfttionalt1, &r. 2558 (fols. 60v —tilr). , 60" eaat or went of Mrcca, The un- The Astronomical Tables of the Islamic Middle Ages 51 derlyiug formula ie siiicpcos AL —tMJfiffitanocm 1 sin AL } { where q is the qibla, fp is the local latitude,

A' /-J( ! it f 1 j 'y^ i r *. 1 ^ f J * t a> W /■ i * V' ’ * V* ** j»/ * Ir i A i r # “ ^' 5, « f J^jb J - i Fig. S. Extra«t from Ihn YG kur’ eintj tablea m MS Berlin Ahlwardt 6752 ( = Landberg 1038, foie. I3v —I4r). The right hand page serves arguments between 22;1° ftad 23i0° and the left hand page serves arguments between 23;10 und 24;0°. The two mam columns on the right band side of each page display the vuluea of the aine function to five sexagesimal digits for each minute of arc, and the two remaining main columns on each page display the differences to be added for each sccond of are.

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