Theodosius <Bithynius>; Clavius, Christoph, Theodosii Tripolitae Sphaericorum libri tres

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_MAGNVM_ quoque compendium in hoc negotio nobis afferet propoſitio octaua.
22Compédiũ
miri
ficum
pro
inuen-
rione
pluti
morum
ſi-
nuum
.
Ex ea enim plurimos ſinus ex alijs inuentis per ſolam additionem, ſubtractionemue
nanciſcemur
.
_N_am ſi ſinum cuiuſuis arcus, qui maior non ſit, quàm grad. _30_. addamus
ſinui
arcus, qui ab arcugrad.
_60_. ſuperatur ſumpto illo arcu, componemus ſinum arcus
qui
eodemillo arcu aſſumpto arcũgrad.
_30_. ſuperat: propterea quod differentia inter
ſinus
duorum horum arcuum maiorum æqualis eſt ſinui arcus illius aſſumpti, qui ma
ior
ponitur, quàm grad.
_30_. vt ibi demonſtrauimus. Vt ſi _3461171_. ſinũ arcus grad.
_20_. Min. _15_. adijciamus ad _6394390_. ſinum arcus grad. _39_. Min. _45._ . qui abarcu grad.
_60_
.
ſuperatur dicto arcu grad. _20_. Min. _15_. conficiemus _9855561_. ſinum arcus grad.
_80_
.
Min. _15_. qui arcum gra. _60_. eodem arcu grad. _20_. Min _15_. ſuperat. Sic ſi _5000000_.
ſinum
arcus grad.
_30_. addamus ſinui _5000000_. arcus grad _30_. quem arcus grad. _60_.
fuperat
dicto illo arcu grad.
_30_. componemus _10000000_. ſinum arcus grad. _90_. qui
arcum
grad.
_60_. eodem illo arcu aſſumpto grad. _30_. ſuperat.
_ITEM_ ſi ſinum cuiuslibet arcus, qui arcu grad. _30_. maior non ſit, ſubducamus ex
ſinu
arcus, qui arcum grad _60_.
ſumpto illo arcu ſuperat, relinquetur ſinus arcus, qui
eodem
illo arcu aſſumpto ab arcu grad.
_60_. ſuperatur. Vt ſi _3502075_. ſinum arcus
grad
.
_20_. Min. _30_ detrahamus ex _9862856_. ſinu arcus grad _80_. Min. _30_. qui arcum
grad
.
_60_. dicto arcu grad. _20_. Min. _30_. ſuperat, reliquus erit _6360781_. ſinus arcus gra.
_39_. Min. _30_. quem arcus grad. _60_. eodemillo arcu grad. _20_. Min. _30_ ſuperat.
_RVRSVS_, ſi ex ſinu cuiuſuis arcus, qui maior ſit arcu grad. _60_. detrahatur ſinus
arcus
, quitanto minor ſit arcu grad.
_60_. quanto ille maior eſt, relinquetur ſinus ar-
cus
, quo vteruis illorũ ab arcu grad.
_60_. differt. Vt ſi ex _9781476_. ſinu arcus gra. _78_.
auferatur _6691306_. ſinus arcus gra. _42_. reliquus erit _3090170_. ſinus arcus grad. _18_.
quo
vterq;
illorũ ab arcu grad. _60_. differt. Quæ omnia ex dicta propeſ. _8_. colliguntur.
_ITAQVE_ ſatis eſt, vt inueniantur per regulam proportionum ſinus ommum ar-
cuum
à principio quadrantis vſque ad arcum grad.
_30_. Si enim ex his eliciantur ſinus
complementorum
, &
ex his inuentis detrahãtur priores illi ſinus, reli qui erunt ſinus
omnium
arcuum inter arcum grad.
_30_ & arcum grad. _90_. Item ſicogniti eſſent ſinus
arcuũ
omniũ ab arcu grad.
_30_. vſq; ad finem quadrantis, & ſinus omniũ arcuum,

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