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# Title: Nicolai Mercatoris Holsati, è Soc. Reg. Institutionum Astronomicarum Libri Duo, De Motu Astrorum Communi & Proprio, Secundum Hypotheses Veterum & Recentiorum præcipuas; Deqve Hypotheseon ex observatis constructione (shelfmark Leibn. Marg. 63)
# Folio 57, page id 820424455:0079
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CaP. 4.
AASTRONOMTA.
daneur prxeter Y. HI A F. leratio A quaroris supra HIOriZOn-
rectum ad A cem, Londini 38. 47.
e
C2. sF. X1, 30 (vel F 12, 600.)
Quaritur angulus L PF H57. 82 (F 12 11 42.54) cui
regualis cst angulus 93O (120.) Hi anguli semel in
venci in nostra Fleratione poli semper erunc ului; ostendunt
enim, quancus sic angulus, quem Equator efficit cum circulo
policionis quoliber. Unde porro in Triangulo 11 VZ (T2
YY) daris r. angulo Z er V, qui est nuper invenci HI FZ s
contiguus. 2. Tr V complementum Ascensionis obligux
Ex domus ad inceorum circulum. 3. TIVX 23,50; in-
veniri porest Y X, live dictancia cuspidis er domus ab aequi-
noctio verno. Sucticit aurem computasse cuspides Orienra-
lium domorum, quae enim his opponuntur, veluri decimae
quarta, undecima quinca, scc. rocidem gradus  Parres
Braduum numerane, sed lioni oppoliti.
Exemplum. Ad annum 2662, mensis Marrii diem cur-
renrem 8. horam 4, 5, ante meridiem, sub Fleratione poli
Londinen(i 5F. 53 sic crigendum Thema C celi. Verus 10-
cus Solis ad dictum tempus est 27. 9053C, _ AIc. ejus Recta
358.076. FIOra 16.5 in tempus converlae dant 241. 25,
qui addiri Ascensioni rectae Solis efficinme 599. 326, e ab-
jectis 360, recttar AIC. Recta Medii C celi 239. 326, cui
respondet per Convertum Probl. l. 1. 45F, quae est cuspis
doruis decima.
Deinde colligo Ascensiones obliquas domorum undecimae
269.326; duodecimXe 299. 326; primee 329. 326; secun-
dx 359,326; cerrix 29, 326, invencisque Fis. XX. angulis
A. FF H 57. 82 (cui requalis est 2 3O) nec non L r2 L
42.54 (cui aequalis est 920) Porro investioo cuspides
domorum, undécimx 15. 15 F; duodecimX 0. 96 W; PrimX
29. 362; Secundae 28. 78gC; cerrix 11. 758. Cxeterum
quoniam decimxe opponitur quarca, haec toridem numerabie
T.45. Sed signi oppolici u. Similicer quinca roridem quor unde-
cima 15. 25, sed oppolici ligni I; sexra 0.96 e0; seprima
29. 36e0; Octava 28. 78M; nona 1Y. 75 M. Sic erectum est
Chema Figura XXI.
PRO.