GNOMONIC CHART PDF

Nearly three hundred years later, the astrophysicist Neil DeGrasse Tyson found himself in a smackdown with Rowbotham soul-mate and rapper B. Cartography is based on the assumption that the world is not flat but an oblate spheroid. The challenge for the mapmaker is how to project that sphere onto a flat surface. In every case, projection involves distortion. It is not possible to peel an orange and reassemble its rind into a seamless flat surface.

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Nearly three hundred years later, the astrophysicist Neil DeGrasse Tyson found himself in a smackdown with Rowbotham soul-mate and rapper B. Cartography is based on the assumption that the world is not flat but an oblate spheroid. The challenge for the mapmaker is how to project that sphere onto a flat surface. In every case, projection involves distortion. It is not possible to peel an orange and reassemble its rind into a seamless flat surface.

The inevitable twisting and stretching distorts the original shape. And so it goes with the Earth. The first and most common is the Mercator projection which girds the Earth in a cylinder and then rolls the cylinder flat. Areas not snug with the cylinder will be stretched to approximate their relative positions.

On the Mercator projection, rhumb lines lines which do not change direction are straight lines and great circles, with the exception of meridians and the Equator, are curved. Gnomonic Projection The second commonly used projection is the gnomonic projection, primarily used for Great Circle charts.

Imagine an enormous plane tangent to the Earth. Points on the Earth are projected onto the plane from a powerful metaphorical light source at the center of the Earth. On the gnomonic projection, all great circles the shortest distance between two points on a sphere are straight lines.

All small circles are curved. Great circles plot as straight lines on the Lambert Conformal projection; rhumb lines plot as curves. Here are some typical examination questions on chart projections.

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Interactive Gnomonic

History[ edit ] The gnomonic projection is said to be the oldest map projection, developed by Thales in the 6th century BC [1] The path of the shadow-tip or light-spot in a nodus-based sundial traces out the same hyperbolae formed by parallels on a gnomonic map. Properties[ edit ] The gnonmonic projection is from the centre of a sphere to a plane tangential to the sphere Fig 1 below. The sphere and the plane touch at the tangent point. Great circles transform to straight lines via the gnomonic projection.

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Gnomonic Projection

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