Described de Ricci, Census, p. 1799 (no mention of items [2–4]); Ives unpub.; P. Pintelon, Chaucer's Treatise on the Astrolabe: MS 4862-4869 of The Royal Library in Brussels (Antwerp, 1940), pp. 31–32; Seymour, Catalogue, 1, pp. 112–113; Linne R. Mooney, The Kalendarium of John Somer (Athens, GA, 1999), p. 71; Sigmund Eisner, A Treatise on the Astrolabe (Norman, OK, 2002), pp. 70–71. An online facsimile of ff. iv, 1–7v, 9, 10–12, 24v, 27r-v may be accessed at the Digital Scriptorium.

[1]

f. 12

Lite lewis my sone i perceyue wel by certayn euydences þin habylite to lerne sciences touchinge numbres and proporcions and as wel considere i þe bisy in specyal to lerne þe tretis of þe astrolabre þanne for as moche as þe philisophre seiþ he wrappiþ him in his frende þat condescendiþ …

f. 24v

… þanne mesure þe space bitwixe þe 2 prickis & þat is þe 12 part of þe altitude of þe tour and so of alle oþer.

Geoffrey Chaucer, ‘Tractatus astrolabij’ (col). A Treatise on the Astrolabe (IPMEP 438; eVK 3388.00 prologue, 7337.00 text). Ed. Riverside Chaucer, pp. 661–683, variants (including the present MS), pp. 1195–1197; another ed. Eisner, with variants from Plimpton 254. Ending corresponds with sec. 43 (Riverside Chaucer, p. 682; Eisner, p. 317), slightly curtailed.

Other texts: IPMEP 438 lists 31 MSS; and see Eisner, p. 32. IMEP 19 indexing CUL Dd.3.53 [1] adds a fragment in London, Royal College of Physicians MS 62, although this should be MS 358; see Catherine Eagleton, ‘A Previously Unnoticed Fragment of Chaucer's Treatise on the Astrolabe’, Journal of the Early Book Society 6 (2003), 161–173 (not cited in IMEP 19). IMEP 19 also adds a fragment in Camb Trinity Col R.14.52, ff. 231v-234 (not noted in IMEP 11); see Edgar Laird, ‘A Previously Unnoticed Manuscript of Chaucer's Treatise on the Astrolabe’, Chaucer Review 34.4 (2000), 414–415. For copies already indexed, see IMEP 9 indexing BodL Ashmole 360 [4], 391 [8] and 393 [1]; IMEP 11 indexing Camb Trinity Col R.15.18 [1]; IMEP 14 indexing NLW 3049 [1], NLW 3567 [1] (not included in the main handlist, but noted in the summary list of authors, index of contents, and index of titles), and Peniarth 359 [1];