Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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ponitur ergo AE, (quæ ſinui DM, arcus grad. </
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<
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<
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">æqualis eſt.) </
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<
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dietate ſinus totius, & </
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<
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">GE, quæ æqualis eſt oſtenſa ſinui CI, arcus grad. </
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<
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<
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<
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<
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">IAM vero, quoniam KF, ipſi EG; </
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<
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">& </
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<
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xml:space
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</
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<
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xml:space
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">erit, KF, ſinui recto CI, æqualis: </
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<
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xml:space
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">Eſt autem KF, ipſi AK, æqualis. </
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<
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erit quoque AK, ipſi CI, æqualis. </
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<
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xml:space
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">Cum ergo AK, ſinui LN, ſit æqualis, erit
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<
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note-127-01
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">34. primi.</
note
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etiam ſinus LN, ſinui CI, æqualis. </
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<
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<
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<
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& </
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<
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<
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<
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">ac proinde arcus BL, cuius ſinus eſt LN,
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continebit grad. </
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<
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<
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<
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<
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">cuius ſinus verſus KC, cõponitur ex CG, medietate ſinus totius, & </
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quæ ſinui verſo EC, arcus CD, grad. </
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<
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<
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dum. </
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<
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demonſtrandum.</
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<
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">CONSTAT cx his, triangulum ACD, cuius baſis CD, ſubtẽdit gradus 36. </
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</
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">habet in centro, eſſe Iſoſceles, cuius vterque æqualium angulorum C, D, reliqui anguli ad
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centrum duplus eſt. </
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">Nam angulus CAD, oſtenſus eſt continere {2/5}. </
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vero C, & </
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inter chor-
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das duorũ
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arcuũ, quo-
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rũ alter tá
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to ſit mi-
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nor arcu
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grad. 120.
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quáto alter
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maior eſt,
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ęquat chot
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dæ arcus,
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quo alteru-
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ter dictorũ
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arcuũ dif-
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fert ab arcu
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grad. 120.</
note
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ſemicirculi, quorum alter tãto minor ſit arcu grad.
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<
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cus, quo alteruter dictorum arcuum ab arcu grad. </
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120. </
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<
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<
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to minor, quanto arcus BE, maior eſt; </
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<
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daturq́ue BF, ipſi BD, æqualis, & </
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<
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differentiã duarũ chor
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<
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fig-127-01
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number
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124
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<
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="
127-01
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xlink:href
="
http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/YC97H42F/figures/127-01
"/>
</
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darum BD, BE, æqua-
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lem eſſe chordæ AE,
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vel AD. </
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<
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circulo, & </
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<
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gulo æquilatero ABG,
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cuius vnum latus eſt
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AB, chorda arcus grad.
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</
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<
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<
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tiã circunferentiæ par-
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tem; </
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<
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tertia pars duorum re-
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<
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position
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xlink:label
="
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21. tertij.</
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ctorum. </
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