Sek bysily with thy rewle the heyest of the sonne in midde of the day; turne thanne thyn Astrolabie, and with a prikke of ink marke the nombre of that same altitude in the lyne meridional. Turne thanne thy riet a-boute til thou fynde a degree of thy zodiak acording with the prikke, this is to seyn, sittinge on the 5 prikke; and in sooth, thou shalt finde but two degrees in al the zodiak of that condicioun; and yit thilke two degrees ben in diverse signes; than maistow lightly by the sesoun of the yere knowe the signe in whiche that is the sonne. And for the more declaracioun, lo here thy figure. 10 15. TO KNOW WHICH DAY IS LYK TO WHICH DAY AS OF LENGTHE, &C. [AD COGNOSCENDUM QUALES DIES IN LONGITUDINE SUNT SIMILES.] Loke whiche degrees ben y-lyke fer fro the hevedes of Cancer and Capricorn; and lok, whan the sonne is in any of thilke degrees, than ben the dayes y-lyke of lengthe. This is to seyn, that as long is that day in that monthe, as was swich a day in swich a month; ther varieth but lite. Also, yif thou take two 5 dayes naturaly in the yer y-lyke fer fro eyther pointe of the equinoxial in the opposit parties, than as long is the day artificial of that on day as is the night of that othere, and the contrarie. And for the more declaracioun, lo here thy figure. 16. THIS CHAPITRE IS A MANER DECLARACIOUN TO CONCLUSIOUNS THAT FOLWEN. [ILLUD CAPITULUM EST QUEDAM DECLARACIO AD CERTAS CONCLUSIONES SEQUENTES.] Understond wel that thy zodiak is departid in two halfe cercles, as fro the heved of Capricorne un-to the heved of Cancer; and agaynward fro the heved of Cancer un-to the heved of Capricorne. The heved of Capricorne is the lowest point, wher-as the sonne goth in winter; and the heved of Cancer is the heyest point, in 5 whiche the sonne goth in somer. And ther-for understond wel, that any two degrees that ben y-lyke fer fro any of thise two hevedes, truste wel that thilke two degrees ben of y-lyke declinacioun, be it southward or northward; and the dayes of hem ben y-lyke of lengthe, and the nightes also; and the shadwes 10 y-lyke, and the altitudes y-lyke at midday for evere. And for more declaracioun, lo here thy figure. 17. TO KNOWE THE VERREY DEGREE OF ANY MANER STERRE STRAUNGE OR UNSTRAUNGE AFTER HIS LONGITUDE, THOUGH HE BE INDETERMINAT IN THYN ASTROLABIE; SOTHLY TO THE TROWTHE, THUS HE SHAL BE KNOWE. [AD COGNOSCENDUM VERUM GRADUM ALICUIUS STELLE ALIENE SECUNDUM EIUS LONGITUDINEM, QUAMVIS SIT INDETERMINATA IN ASTROLABIO; VERACITER ISTO MODO.]