Harley MS 13
c 1290-16th century, The volume is composed of 6 semi-independent parts (ff. 3r-128r; 129r-140r; 141r-164v; 165r-198v; 199r-230; 231r-241v). It was probably made for John of London (fl. c. 1290- c. 1330), the first recorded owner of the manuscript. The manuscript includes: 1. Flyleaf with ownership inscriptions (ff. 1r-1v); 2. Theorica planetarum Gerardi attributed to Gerard of Cremona (ff. 3r-8v);3. 'Canones Luce de utraque eclipsi solis et lune' (ff. 25v-29v);4. Campanus of Novarra, Rule and table for converting Christian years (from AD 1260) into Arab years (f. 30r);5. Toledan tables (ff. 31r-38v);6. A table for converting Christian years into Arabic years with an explanatory text (f. 30v) 7. Toledan tables (ff. 39r-116v);8. Thebit ben Corat, De motu octave spere (ff. 117r-119v);9. Thebit ben Corat, De hiis que indigent expositione antequam legatur Almagesti (ff. 119v-122r);10. Thebit ben Corat, De recta imaginatione spere (ff. 122r-123r); 11. Thebit ben Corat, De quantitatibus stellarum et planetarum et proportione terre (in Latin translation) (ff. 123v-124v);12. Jordanus de Nemore, De plana spera (ff. 124v-128v);13. Euclid, Catoptrica (sometimes also attributed to Jordanus de Nemore as De speculis) (ff. 129r-133v);14. De ratione ponderi attributed to Jordanus de Nemore (ff. 133v-140r);15. 'De sole' (ff. 140r-140v); 16. Pseudo-Ptolemy, Centiloquium, with a commentary of Haly ibn Ridwan (ff. 141r-164v);17. Al-Kindi, De radiis (or Theorica artium magicarum) (ff. 165r-173r);18. Messahala, De cogitationibus ab intentione (ff. 173r-173v);19. Messahala, Libellus interpretationum sive De inventione occultorum (Latin translation incorporating parts of Dorotheus and Ptolemy on occulta) (ff. 173v-175r);20. Theodosius, De spheris (ff. 175v-194v);21. Mileus (or Menelaus) of Alexandria, De figuris sphericis, in Latin translation by Gerard of Cremona (ff. 195r-198r);22. Alcabitius, Liber introductorius, in Latin translation by John of Seville (ff. 199r-218v);23. Messahala, Liber coniunctionis et receptionis in Latin translation by John of Seville (ff. 218v-228v);24. John of Seville, Glossa super 60 propositionem Centiloquii Ptolemei (ff. 229r-230r);25. Messahala, De motibus (De orbe) (ff. 231r-241v);26. Alphabetical index 14th century (f. 242r).The text was written by several scribes probably over a period of time, but the decoration was completed in one location in England.Decoration:2 historiated initials, in colours and gold, and partial bar borders with zoomorphic elements (ff. 129r, 133v). Large initials in colours and gold with foliate decoration, some with animal or human heads and partial bar borders at the beginning of texts. Small initials in blue with red pen-flourishing, or in red with blue pen-flourishing. Paraphs in red or blue. 5 volvelles, all now broken (ff. 3r, 3v, 4v, 5r, 6v). Numerous diagrams in colours. Tables in brown and red (ff. 12r, 18r, 30r-116r, 120r, 200v, 201v, 202r). Capitals highlighted in red.
 
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