A Treatise On the Astrolabe

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« Pt I. § 12. ' Pt I. § 13. « Pt II. § 1.
^ PtII. §2. " PtII. § 3.
90 ASTROLABIUM MESSEHALLB.
occidens. Quod uero ceciderit in linea medii cell est in medio celo, ct eius nadays angulus terre.
^Et si ceciderit inter duo almucliantlierath, vide differentiam 56 numeri inter almuchantherath precedentem et altitudinem solis, et denomina differentiam de numero longitudinis almuchantherath, quod est . 6. , si almuchantherat continet . 6. Gradus et . 6. ; quod si almuchan- terath contineat . 3. Gradus
... et . 3. , denomina partem illorum de . 3. ; et 60 sic de aliis. Postea scito motum almuri ab initio primi ahnuchan- thanth usque ad inicium secundi de gradibus marginis; et pone super illorum partem denominatam ab eis, secundum proportionem differentie dicte, ex . 6. Vel de . 3. Gradibus; et tunc habebis certum 64gradum inter duo almuchantherath; et tunc considera eas horas, &c. , sicut dictum est superius. Si illud idem in nocte scire desideras, accipe altitudinem alicuius stelle, in alhanthabuth descripte, que transit ex parte orientis uel occidentis ; et pone cacumen illius stelle 68 in almucantherath sue altitudinis, et gradus solis indicabit tibi horas noctis, sicut nadayz eius diei ; de aliis fac omnibus sicut dictum est in superioribus.

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