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
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… … Kg. 11. UTTMARKS GUIDE 14.—*What is the Vertexof a great Circle? The point of a great circlewhich is nearest the pole iscalled its Vertex, C D is a great circle. Pis the Pole to the circle. Vis the vertex of the circleC D. (Fig. 12.) 15.—*What is the Equator?
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