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# Title: Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences (shelfmarks Leibn. Marg. 71; ZEN Leibn. Marg. 71)
# Folio - , page id 806933011:0768
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And chis is the general Rule ro measure the Artes of
au Oblique Cireles, PrOP. 18. C a(C 3.
For che Angles.
Thar at R, id a Rixtr one, and Co non.
Thac ac V, is che Angle oF etie Suns grearest
Oeclination == 23 Deorees, 30 Minures, and its
Measure is che Ark P. C oF the Limb, bY ProB. 19.
Numb. T.
First, Dtam che Cirele hn B, reprelengne che
Meridian, and then che Diameter h R, Forthe HO.
Fizon oF London: Sec che Poles heighe SI Degrees.
30 Minures trom R co n che Norch. Pole, and
deaw che ObsCure ATIS, n V Si Then if the
Suns Amplitude be siven, set chac, Suppole 39De
Brees 52 Minures, Ll V 10 Ce, irhich vill si-
The Anele oFche Suns Posirion S, is measured miethe Base B, and sive a Point thro Wohich and
by lavins a Ruler thro 8, che Angular Point, and
chro a and I, ihe Poles of che Circles C V R, and
NY 8 Z, Wrhich will sind che Poines a and L in the
Timb, and che APt a L = 72 Degrees, is the
Mcasure oE che Ansle S required, by Prop. 19.
Numb. 3.
Tou may consider also, che Frianele Z C 8.
ertrere one Angle is ac che Peripherr ot che Primi-
rire Circle, and this will help to Mer che Varie-
ties oF Righr angled Spherick Friangles.
Flere che Anele C is a Righe one, beins made
by an LTour Circle, or che Meridians currine che
LQuatOY; For here C K mar represent che Liqua-
FOF, and lec Z bC the Zenich oE any Place, then
Wwill CS be chic FTour from Noon; CZ will bc
che Lacirude of che Place, and 8 Z, the Comple-
ment of che Suns Feiphr, beins nou supposed r0
be in che Equator. The Ansle Z, will beche
Suns Azimuth trom ehie Souch, the Oblique Circle
Z. S R XV, beins a Verrical one; and the Angle
S, Will bethe Ansle oFche Suns Position. Which
Friansle C 8 Z may be formed, and all irs Side
and Ansles meatured by che Proposions and Rule
checwo ocher siren Poines nand S, a great Circle
masbe dravn, wrhich illForm the Triansle. Buc
iC instead of char, che Angle On R, or the Time
trom Midnighe had been siren, chen you mustrurm
chac Time into Degrees, and by Prop. 15. C ase 2
make a Spherick Angle wich che Limb, oF chac
Number OE Degrées, arche Poinen, and chac wiit
decermine che Point O.
The Ansse On R, is measured by Prop. 19.
Case 2.
Thus also in Oblique ano led Spherick
Triansles, al the Sides and Aneles may
(hy this Method) be measuredus and the
Triancles constructed.
Inche Follomins Obruse angled Spherick Tri
ansle  Z NI.
ZVI= ro rhe Complement of the Poles Flera-
tion, = 38 Degrees, 30 Minures.
ON = che Complement of che Suns Oeclina-
tion trom che Lquator L O.
CZ == 46 Derrees 49 Minutes = che Com-
plement ot che Suns Alcicude abore che Hori-
ZOn BR.
ON Z = 30 Degrees, is che HTour trom Noon,
Ox Pen a Clock in the Norning.
9Z N = 137 Degrees 17 Minures is thesuns
Rmurh From Z. R n, chc Norrh pare OF chC MC-
ridian.
abore delivered..
ASaIn
Ld describe this Triansle.
In c Righeangled Spherick Lriansle, NO R
Rchi Righe Ansle made berween che LIOIIC
IIR and the Meridian n R.
B = Complement oF dS Amplicude = 50DC.
Prees B Minutes.
FI = coche Suns Distance From the Pole above
etie FTorizon hR; or che Complemene ol his DC
clinarion.
P = to the Flerarion oF the Pole, or Latimde
oF che Place.
== ehc Ansleo ine SunS Polition.
n R =20 che LTour Trom Midnietr.
To Construa iha Triansle.
F. Wich 60 Degrees OF a Linc oF Chords, draw
che Primicire Circle Z. R n h; wvhich cross in che
Eenlec mich cmo Diameceto, B R represemins. ihe
Floriron