Uttmark's guide to the United States local inspectors examination for masters and mates of ocean going steam and sailing ships (1919)
Uttmark, Fritz E · [New York] The Author · leaf 32
A straight line drawn fromthe center of a circle to itscircumference is called Ra-dius. The lines A B, A Cand A D are radius to thecircle in Fig. 9. Fig. 9 DEFINITIONS lh—*What are Small Circles? Circles whose planes donot pass through the centerof the sphere are calledsmall circles. AB, CD, EFand… … Fig. 10. 12.—*What are Zenith and Nadir? The point vertically overhead of the observeris called Zenith and the point vertically beneath iscalled Nadir. 13.—*What are Vertical Circles? Great circles passing through Zenith perpendic-ular to the Horizon are calledVertical Circles or Verticals,Z is the…
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![An illustration from Cosmographia Francisci Mavrolyci Messanensis Sicvli : in tres dialogos distincta, in quibus de forma, situ numerʹoq[ue] tam coelorum q[uam] elementorum, alijsq[ue] rebus ad astronomica rudimenta spectantibus satis disseritur (1543)](https://img.insideoutlibrary.com/img/200/ia-cosmographiafran00maur-128-0.webp)
