Ball, R[obert] S[tawell], Sir, 1840- [from old catalog] · New York, H. Holt and company · leaf 31
equatorial be not pointedexactly to the correct point of the heavens, it will notbe found that a star can be followed from its risingto its setting without altering the angle boq. There isonly one point visible in this hemisphere to which thepolar axis can be directed so as to fulfil this… … The Equatorial Telescope, 13 when pointed to a certain star. Then the apparentmotion of the star is such that the angle sep remainsconstant. Now, since the arc P s is proportional tothe angle p e s, it follows that the arc p s remains con-stant, and that therefore the arcs p s, p l, p m, p n,drawn…
Astronomy
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