3E3 



(130) 



fiimt normales. Appropinquante itaquc pundo MadZ, A-B 

 decrefcit , et fimuiac M ad alteram pundi 2 partem cadit , 

 difFerentia A — B fit negativa ; confequenter , cadente M in 

 2 , effe debet a — (3 — o , feu proieflio Paralleli ipfius Ze^ 

 nith eft circulus radio a — (3 defcriptus. Calculus etiam ifto 

 cafu , ob (3^ — ($>'' , 5; rr 2'' , praebet 



1 — COj. 2 [3 ' ' 



Q — °±S3Lf^ —laz cot. B' 



/2 11— CO/. ^P') 



a. 



Quando M eft pundum Aequatoris, z'^ idcoque et dif- 

 fcrentia A — B eft Maximum , unde proiedio Aequatoris eft 

 ellipfis maxime oblonga. Fit nempe hocce cafu s^ — i , 

 Cb" ziz o , ergo a = "'^■^'''•f^ , , et (3 zi: - — " ^ _, , ideoque 



" " -> zz — coj.2(3'' ' ■ y(2. z — cq/.2(3) ' ^ 



«g -_ zzjin.'^' Eiiminari hinc poteft z. quia 



p ,3 z 2 — cq/. 2 (3' ■^ ' ^ 



^ ~ — coj.-p'-I-m-Jm.-p' ' ^§* ^'^' 



unde reperitur 



a a fin. » P' 



PP i^-caj.*^' — m'/;n.» P''cq/."i3'' i — (m^ — i ) co/.» p' ' 



Quodfi nunc ftatuamus ^ zz: ?-J zz ;// 7« , fict 

 cof." a' — f 7' , 5 



t m^ 1TO*~ i) ' 



ct cof. p^=r ^ — o, 99565, proindc i^-" — 5** 20^ 41'''', et /3 =r 

 5' 23^ 2 8''''. In proicdione itaque ftcreographica horizontali , 

 cuius 2cnith cft fiib Jatitudine =: 5° 23^ 28''^, Aequator pro- 

 iicitur in eUipfin Meridianis ellipticis in tclluris fuperficic fi- 

 milem. Eodcm cafu axes funt : 



a 



ct (3 — " 



_ — — 10, 8204.4- . <?, 



m 



Caetcrum proie^io a pundi A in Aequatorc (Fig. 10.), 

 quae eft vertex cliipfeos acquatorialis , rcperitur , fi in aequa- 



tione 



