Tak the altitude of this sterre whan he is on the est side of the lyne meridional, as ney as thou mayst gesse; and tak an assendent a-non right by som maner sterre fix which that thou knowest; and for-get nat the altitude of the firste sterre, ne thyn assendent. And whan that this is don, espye diligently whan this 5 same firste sterre passeth any-thing the south westward, and hath him a-non right in the same noumbre of altitude on the west side of this lyne meridional as he was caught on the est side; and tak a newe assendent a-non right by som maner sterre fixe which that thou knowest; and for-get nat this secounde assendent. And 10 whan that this is don, rikne thanne how manye degrees ben by-twixe the firste assendent and the seconde assendent, and rikne wel the middel degree by-twene bothe assendentes, and set thilke middel degree up-on thin est orisonte; and waite thanne what degree that sit up-on the lyne meridional, and tak ther the verrey degree 15 of the ecliptik in which the sterre stondeth for the tyme. For in the ecliptik is the longitude of a celestial body rekened, evene fro the heved of Aries un-to the ende of Pisces. And his latitude is rikned after the quantite of his declinacion, north or south to-warde the poles of this world; as thus. Yif it be of the sonne or of any 20 fix sterre, rekene his latitude or his declinacioun fro the equinoxial cercle; and yif it be of a planete, rekne than the quantitee of his latitude fro the ecliptik lyne. Al-be-it so that fro the equinoxial may the declinacion or the latitude of any body celestial be rikned, after the site north or south, and after the quantitee of his declinacion. 25 And right so may the latitude or the declinacion of any body celestial, save only of the sonne, after his site north or south, and after the quantitee of his declinacioun, be rekned fro the ecliptik lyne; fro which lyne alle planetes som tyme declynen north or south, save only the for-seide sonne. And for the more 30 declaracioun, lo here thy figure. 18. TO KNOWE THE DEGREES OF THE LONGITUDES OF FIXE STERRES AFTER THAT THEY BEN DETERMINAT IN THIN ASTROLABIE, YIF SO BE THAT THEY BEN TREWLY SET. [AD COGNOSCENDUM GRADUS LONGITUDINIS DE STELLIS FIXIS QUE DETERMINANTUR IN ASTROLABIO, SICUT IN SUIS LOCIS RECTE LOCENTUR.] Set the centre of the sterre up-on the lyne meridional, and tak keep of thy zodiak, and loke what degree of any signe that sit on the same lyne meridional at that same tyme, and tak the degree in which the sterre standeth; and with that same degree comth that same sterre un-to that same lyne fro the orisonte. And for more 5 declaracioun, lo here thy figure.