Geoffrey Chaucer's
The Treatise on the Astrolabe
The Treatise on the Astrolabe
The Treatise on the Astrolabe - Prologue
The Treatise on the Astrolabe - Part I
Astrolabe - Part I, Section 1
Astrolabe - Part I, Section 2
Astrolabe - Part I, Section 3
Astrolabe - Part I, Section 4
Astrolabe - Part I, Section 5
Astrolabe - Part I, Section 6
Astrolabe - Part I, Section 7
Astrolabe - Part I, Section 8
Astrolabe - Part I, Section 9
Astrolabe - Part I, Section 10
Astrolabe - Part I, Section 11
Astrolabe - Part I, Section 12
Astrolabe - Part I, Section 13
Astrolabe - Part I, Section 14
Astrolabe - Part I, Section 15
Astrolabe - Part I, Section 16
Astrolabe - Part I, Section 17
Astrolabe - Part I, Section 18
Astrolabe - Part I, Section 19
Astrolabe - Part I, Section 20
Astrolabe - Part I, Section 21
The Treatise on the Astrolabe - Part II
Astrolabe - To fynde the degre in which the sonne is day by day, after his cours aboute.
Astrolabe - To knowe the altitude of the sonne or of othre celestial bodies.
Astrolabe - To knowe every tyme of the day by light of the sonne; and every tyme of the nyght by the sterres fixe; and eke to knowe by nyght or by day the degre of eny signe that ascendith on the est orisonte, which that is clepid comounly the ascendent, or ellis horoscopum.
Astrolabe - A special declaracioun of the ascendent.
Astrolabe - To knowe the verrey equacioun of the degre of the sonne yf so be that it falle bitwene two almykanteras.
Astrolabe - To knowe the spryng of the dawenyng and the ende of the evenyng, the whiche ben called the two crepuscules.
Astrolabe - To knowe the arch of the day, that sorne folk callen the day artificiall, fro sonne arisyng tyl it go to reste.
Astrolabe - To turne the houres inequales in houres equales.
Astrolabe - To knowe the quantite of the day vulgar, that is to seyn fro spryng of the day unto verrey nyght.
Astrolabe - To knowe the quantite of houres in, equales by day.
Astrolabe - To knowe the quantite of houres equales.
Astrolabe - Special declaracioun of the houres of planetes.
Astrolabe - To knowe the altitude of the sonne in myddes of the day that is clepid the altitude meridian.
Astrolabe - To knowe the degre of the sonne by thy ryet, for a maner curiosite.
Astrolabe - To knowe which day is lik to which day as of lengthe.
Astrolabe - This chapitre is a maner declaracioun to conclusiouns that folewen.
Astrolabe - To knowe the verrey degre of eny maner sterre, straunge or unstraunge, after his longitude; though he be indetermynat in thin Astralabye, sothly to the trouthe thus he shal be knowe.
Astrolabe - To knowe the degrees of longitudes of fixe sterres after that they be determynat in thin Astrelabye, yf so be that thei be trewly sette.
Astrolabe - To knowe with which degre of the zodiak eny sterre fix in thin Astrelabie arisith upon the est orisonte, all though his dwellyng be in another signe.
Astrolabe - To knowe the declinacioun of eny degre in the zodiak fro the equinoxiall cercle.
Astrolabe - To knowe for what latitude in eny regioun the almykanteras of eny table ben com powned.
Astrolabe - To know in speciall the latitude of oure countre, I mene after the latitude of Oxenford, and the height of oure pool.
Astrolabe - To prove evidently the latitude of eny place in a regioun by the preve of the height of the pool artik in that same place.
Astrolabe - Another conclusioun to prove the height of the pool artik fro the orisonte.
Astrolabe - Another conclusioun to prove the latitude of the regioun.
Astrolabe - Declaracioun of the ascensioun of signes.
Astrolabe - This is the conclusioun to knowe the ascensions of signes in the right cercle, that is circulus directus.
Astrolabe - To knowe the ascensions of signes in the embelif cercle in every regioun, I mene, in circulo obliquo.
Astrolabe - To knowe justly the 4 quarters of the world, as Est, West, North, and South.
Astrolabe - To knowe the altitude of planetes fro the wey of the sonne, whethir so they be north or south fro the forseide wey.
Astrolabe - To knowe the cenyth of the arising of the sonne, this is to seyn, the partie of the orisonte in which that the sonne arisith.
Astrolabe - To knowe in which partie of the firmament is the conjunccyoun.
Astrolabe - To knowe the cenyth of the altitude of the sonne.
Astrolabe - To knowe sothly the degre of the longitude of the mone, or of eny planete that hath no latitude for the tyme fro the ecliptik lyne.
Astrolabe - This is the worchynge of the conclusioun to knowe yf that eny planete be direct or retrograd.
Astrolabe - The conclusioun of equaciouns of houses after the Astrelabie.
Astrolabe - Another maner of equaciouns of houses by the Astrelabie.
Astrolabe - To fynde the lyne meridional to dwelle fix in eny certeyn place.
Astrolabe - Descripcion of the meridional lyne, of longitudes and latitudes of citees and townes, as wel as of climates.
Astrolabe - To knowe with which degre of the zodiak that eny planete ascendith on the orisonte, whether so that his latitude be north or south.
Supplemental Propositions to the Astrolabe