The situation is actually even more complicated because Earth is not a homogeneous smooth sphere. Only on the equator and at the North and South Poles does the plumb line align with the local radius. In this sense, a plane can, arguably, be both horizontal and vertical, horizontal at one place, and vertical at another.įor a spinning earth, the plumb line deviates from the radial direction as a function of latitude. at the same time, a vertical plane for points on the equator. (See diagram).įurthermore, the equatorial plane is parallel to the tangent plane at the North Pole and as such has claim to be a horizontal plane. In particular, a plane tangent to a point on the equator intersects the plane tangent to the North Pole at a right angle. The two intersect at a right angle.Īlso, horizontal planes can intersect when they are tangent planes to separated points on the surface of the Earth. In the example shown, the blue line represents the tangent plane at the North pole, the red the tangent plane at an equatorial point. On a spherical planet, horizontal planes intersect. This fact has real practical applications in construction and civil engineering, e.g., the tops of the towers of a suspension bridge are further apart than at the bottom. Strictly speaking, it is now no longer possible for vertical walls to be parallel: all verticals intersect. On the surface of a smoothly spherical, homogenous, non-rotating planet, the plumb bob picks out as vertical the radial direction. When the curvature of the Earth is taken into account, the concepts of vertical and horizontal take on yet another meaning. Girard Desargues defined the vertical to be perpendicular to the horizon in his 1636 book Perspective.įurther information: Local tangent plane Strictly, vertical walls are never parallel on the surface of a spherical planet The word vertical is derived from the late Latin verticalis, which is from the same root as vertex, meaning 'highest point' or more literally the 'turning point' such as in a whirlpool. The word horizontal is derived from the Latin horizon, which derives from the Greek ὁρῐ́ζων, meaning 'separating' or 'marking a boundary'. In general, something that is vertical can be drawn from up to down (or down to up), such as the y-axis in the Cartesian coordinate system. Ĭonversely, a direction or plane is said to be horizontal (or leveled) if it is perpendicular to the vertical direction. In astronomy, geography, and related sciences and contexts, a direction or plane passing by a given point is said to be vertical if it contains the local gravity direction at that point. The comprehensive solution at scale provides an outstanding opportunity to deliver value and meet Verizon’s wireless infrastructure needs for years to come.For other uses, see Vertical and horizontal (disambiguation). “This new model, designed to deliver value for both parties, is a demonstration of strong collaboration and mutual benefit between a carrier and a tower company to accelerate infrastructure development in the US,” said Ron Bizick, President and CEO, Vertical Bridge. “We are committed to rapidly building the infrastructure needed to drive the wireless telecommunications industry forward.” “We continue to focus on technology innovation and fast deployment to enable greater connectivity for our customers.” This cost-effective, sustainable and efficient model will allow us to accelerate our build program and provide additional services to customers,” said Lynn Cox, Chief Engineering Officer for Verizon. “Our new agreement with Vertical Bridge is an excellent alternative to the traditional tower leasing model. The new towers will add to the overall communications infrastructure in the US, and will help to fulfill the need for new locations where towers do not exist today to continue to enhance the wireless experience. Vertical Bridge has agreed to construct these towers to-suit with Verizon as the anchor tenant. The towers will be held in an LLC formed by Vertical Bridge in which Verizon has a profits interest. NEW YORK - Verizon and Vertical Bridge have entered into an agreement to build cell towers across the US to expand Verizon’s 4G and 5G Ultra Wideband services.
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