A short course in astronomy and the use of the globes (1871)
Kiddle, Henry, 1824-1891 · New York, Chicago, Ivison, Blakeman, Taylor & co. · leaf 15
always the 24. What is a triangle ? A right-angled triangle ?25. What are parallel lines ? 26. What is an ellipse ? An equilateral triangle? 12 INTR OB UCTION. … The curve line DBEG represents an ellipse, the sum of the twostraight lines drawn to F and F,the foci, from the points A, B,and C, respectively, being alwaysequal. This sum is equal to thelongest diameter, D E. 27. The longest diameterof an ellipse is called theMajor Axis ; and the short-est…
Astronomy
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-123-337.webp)
