The student who has studied plane geometry should be able to prove that one half of the angle between these lines is equal to the altitude of the star.
"A Text-Book of Astronomy"
George C. Comstock
The perpetual importance of definition has been largely due to the great prestige in modern philosophy of the method of geometry, which was regarded by Descartes and Spinoza as the model for systems of necessary truth.
"The Approach to Philosophy"
Ralph Barton Perry
On the other hand the triangle as defined by geometry is the fixed and unequivocal nature or idea which such experiences suggest; and the philosophical mind will at once pass to it from these.
"The Approach to Philosophy"
Ralph Barton Perry