^ Dt MDTIB. STELLiE MARTIS PROTHEOREMATA. Cap. LIX. i. I intra circulum defcribatur ellipfis, tangens verticibus circulum, m pun&is oppofitis ; & per centrum & pundla conta6tuum duca- tur diameter 5 deinde a pun&is aliis circumferenticX circuli ducantur per pendiculares in hanc diame- trum: cx… … quam di£tx \incx . Vi enim bh adnz >Jic area ellipjeos abc ad aream circuli a e c . Eft quinta Sph&roideon Archimedis. Si a certo pun£lo diametri educantur linese in fedtiones ejusdem perpendicularis,cumcirculi&el- lipfeos circumferenna ; fpacia ab iis refcilTa rurfum erunt in proportione fe&x…
Astronomy
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