| John Gummere - Astronomy - 1837 - 477 pages
...right angles. A straight line in the direction of gravity at any place is called a Vertical Line. 12. **The Prime Vertical is that vertical circle which is at right angles to the meridian** of any place. The prime vertical cuts the horizon in two points, called the East and West Points of... | |
| John Gummere - Astronomy - 1842 - 471 pages
...The meridian ZRNH is a vertical circle, and ZSB, ZS B' and ZS"B" are arcs of vertical circles. 33. **The Prime Vertical is that vertical circle which is at right angles to the meridian** of a place. It cuts the horizon in two opposiie points, called the east and west points of the horizon.... | |
| Ezra Otis Kendall - Astronomy - 1845 - 365 pages
...Vertical Circle is a great circle passing through the zenith and nadir, perpendicular to the horizon. **The Prime Vertical is that vertical circle which is at right angles to the meridian** of the place, and cuts the horizon in the east and west points. The Ecliptic is the path through which... | |
| William C. Seaton - Merchant mariners - 1875 - 272 pages
...circles passing through the Zenith. They are consequently perpendicular to the hori/on. . Def. 36. **Prime Vertical is that vertical circle which is at right angles to the** Celestial Meridian. Thrrefort; ;iny object upon the Prime Vertical must bear due East or W.'.-it. Def.... | |
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