= ^'i^O =-: 

 X X^ == 2 i3 =r R X -1- R X^ ~ ^LHJL. — JJ.2. = *J M ; 



' uu — ^ y m m. X ax 



iibi notatii dignuin cft, -''* cflc paramctriuii tllipfcos Mcridia- 

 noriim, abfciins ncnipc capti^ iii axc maiorc, qiii li dicatur p, 

 liabcmus x : y ^z p : 2 p, undc conlliuclo horizontc mappae el-r 

 liptico , facilis refultat mcthodus , omnium Parallclorum axcs 

 gconietrice invcnicndi. Si nempc (Fig.S.) A P G fit hori/.on, et 

 quiilcm C A r «, C P r ^, et F altcr focus, agatur ordinata F G, 

 et G g fhnciC A F paralicla, quac fi reclac C I- iModuc^tac occurrat 

 in punc"co /", erit gf-(l. Qnodfi itaquc radius Parallcli fcu y 

 dilhintiae foci a ccntro CF fit acqualis, fcu .r — >/ (a a— Z» ^) 

 =r -" ■/(;«-— 1), crit (3 ipfi radio acqualis, vel ^ — y. Nam 



fi )' =: C F , crit .r — F G =r -! /> , ct ^ =z f^^ =j. Cctcrum 

 cil a-°^-^~^. Ducla itaouc P /' lincac A C parallcla, erit ? hsa. 



Tn mappis aufcm conftrucndis praeftat, nxcs pcr latitu- 

 dincm ParallcH (cu [3 cxprimcrc. Qucm in fincin mcminifTc 

 oportet, eflc /w w .v rrz^ tang. [3 (§.30-) ""'^c fit (cmiaxis mi- 

 nor fcu (3 m -"-^ m a cot. i3 , ct a — ;;; a cot. (3. Fit iiaque 



f3=:-r, ^^y= V,m^:i.,y, .(^' 3.) = -^/(«^^-i;, h. c. 



m* = ( ;;;'- — i ) ( ;/;M- tang.' ,3 ) , proindc tang. (i z= -^?-^, 

 — ic, 735 idcoquc pro Parallclo, cuius latitudo in 84-". -fi''. 



j-jj^, j §• 12- Ad con/iruc/iofiein ParaUclorum quod attinct , 



Fig. 9. fit C tabulac fcu hori/,ontis ccntrum , P altcr polus , K X K 



proicdio Parallcli, cuius latitudo =r: j3i cuius clliplcos fi ccn- 



trum fit jjL, crit 



X|Ji=:(3— rtcot. (3, ct CX— -.^'.^(§. ii.)z=^. 



In proiccftione fphacrica paritcr c(l 



X |JL ~ fl cot. (3, ct C ;;. ~ n cofcc. (3, 



idco- 



