Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica
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CHRISTIANI HUGENII
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gitudine minus diſtet quam partibus 85; </
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<
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xml:id
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echoid-s1954
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xml:space
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">(Eſt enim arcus
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A B, per ea quæ ſupra oſtendimus, major quam 7853981)
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partes autem 85 efficiant minus quam duos ſcrupulos ſecun-
<
lb
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dos, hoc eſt, quam {2/1296600} circumferentiæ, nam tota earun-
<
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dem plures habet quam 60000000: </
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<
s
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echoid-s1955
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xml:space
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">Hinc manifeſtum eſt, ſi
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trianguli rectanguli angulos quæramus ex datis lateribus, eo
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modo quo majorem iſtum terminum paulò antè, nunquam
<
lb
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duobus ſcrupulis ſecundis aberraturos; </
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<
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xml:id
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echoid-s1956
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xml:space
="
preserve
">etiamſi æqualia inter
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ſe fuerint latera circa angulum rectum, veluti hic erant in
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lb
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triangulo D A M.</
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<
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xml:space
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</
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<
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<
s
xml:id
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echoid-s1958
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xml:space
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">Si vero ea ſit ratio lateris D M ad M A, ut angulus A D M
<
lb
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non excedat {1/4} recti; </
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>
<
s
xml:id
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echoid-s1959
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xml:space
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">non unius tertii ſcrupuli error erit. </
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>
<
s
xml:id
="
echoid-s1960
"
xml:space
="
preserve
">Po-
<
lb
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ſito enim arcu A B {1/16} circumferentiæ, erit A M ſemiſſis la-
<
lb
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teris octanguli æquilateri circulo inſcripti partium 382683433,
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non unâ minus. </
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<
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echoid-s1961
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xml:space
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">A B vero latus ſexdecanguli 390180644
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non unâ amplius, qualium radius D B 1000000000. </
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<
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="
echoid-s1962
"
xml:space
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preserve
">Unde
<
lb
/>
primus minor terminus longitudinis arcus A B invenitur par-
<
lb
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tium 392679714. </
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<
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xml:id
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echoid-s1963
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xml:space
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">Terminus autem major 392699148. </
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<
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echoid-s1964
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xml:space
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">Et ex
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his minor rurſus 392699010. </
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<
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echoid-s1965
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xml:space
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">Conſtat autem ex ſupra demon-
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ſtratis arcum A B {1/16} peripheriæ, majorem eſſe quam
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392699081, quas terminus major ſuperat partibus 67. </
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<
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echoid-s1966
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xml:space
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">Hæ
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autem minus efficiunt uno ſcrupulo tertio, hoc eſt, {1/77760000} to-
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tius circumferentiæ, quoniam ea major eſt utique quam
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6000000000.</
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xml:space
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</
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<
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<
s
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echoid-s1968
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xml:space
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">Porro ex noviſſimis terminis inventis orietur ratio circum-
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ferentiæ ad diametrum minor quam 3141593 {1/5}, major autem
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quam 3141592 ad 1000000.</
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</
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<
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xml:space
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">Quod ſi {1/60} circumferentiæ ponatur arcus A B, ſeu par-
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tium 6 qualium tota 360: </
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echoid-s1971
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xml:space
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">Erit A M ſemiſſis lateris trigin-
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tanguli inſcripti partium 10452846326766, non unâ minus,
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qualium radius 100000000000000. </
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<
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echoid-s1972
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xml:space
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">Et A B latus ſexagintan-
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guli inſcripti 10467191248588 non unâ amplius. </
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<
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xml:space
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que ex his arcus A B ſecundum primum minorem terminum
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10471972889195. </
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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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">Et ex his minor alter terminus 10471975511302. </
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<
s
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echoid-s1976
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xml:space
="
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">Unde
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lb
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efficitur peripheriæ ad diametrum ratio minor </
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