. Trigonometria. rary. LetMCONbe^of thefphere; MCOthe^of theEquinoctial plane, whofe pole is N, O ID M the £ ofthe Ecliptick plane. MNO halfe the plane of the Equi-noctial Colure. N IG a Quadrant of a meridian circlewhich with the Colures cutteth the Equator at right an-gles , but the Ecliptick at oblique. In this Quadrant o£thefphere, there are found two right angled fpftericaltriangles, DOC and IO G, the Hypotenufaes where-of are D O and IO. The perpendiculars D C and the Bales O C and O G. The acute angle at the Ba-fes D O C, 10 G. The fines of the Hypotenufaes O Dand OI, let be the
. Trigonometria. rary. LetMCONbe^of thefphere; MCOthe^of theEquinoctial plane, whofe pole is N, O ID M the £ ofthe Ecliptick plane. MNO halfe the plane of the Equi-noctial Colure. N IG a Quadrant of a meridian circlewhich with the Colures cutteth the Equator at right an-gles , but the Ecliptick at oblique. In this Quadrant o£thefphere, there are found two right angled fpftericaltriangles, DOC and IO G, the Hypotenufaes where-of are D O and IO. The perpendiculars D C and the Bales O C and O G. The acute angle at the Ba-fes D O C, 10 G. The fines of the Hypotenufaes O Dand OI, let be the right lines AD the whole fine, andP I. The fines of the perpendiculars D C and IG let bethe right lines D B and IH, I fay that the fines of theHypotenufaes A D, P I, are proportiortional to the finesof the perpendiculars D B, I H, and the contrary. For the triangles B A D, H PI, are like, becaufe theright lines D B, IH are perpendiculars ro the fame plane;and the parallel lines D A, IP, arc in the fame plane of.
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Keywords: ., bookcentury1600, bookdecade1650, bookidtrigonometri, bookyear1658
