World Map OverlayĪn interesting co-incidental quirk of polar Sun-path diagrams is their direct relationship with a spherical world map of the same radius centered at the geographic location of the site. The Equidistant projection shows all altitudes the same by using a simple linear scale. The Spherical projection expands values at the zenith and contracts at the horizon whilst the Stereographic projection does the opposite. In order to expand those areas of interest, different types of diagram map altitude in different ways. Sun-path diagrams are used in many different fields, some of which are more interested in what happens near the zenith, and others in what happens nearer the horizon. This is only really possible in the polar diagrams, but I discuss this in more detail below. Here again I have tried to adjust the map projection to match the diagram such that the path of the Sun throughout the year is faithful to its sub-solar position on the Earth’s surface. You can also display a World map centered at the current geographic location. Thus I have tried to animate the transitions meaningfully between each projection in order to visually highlight their differences. The aim of this app is to illustrate the relationship between different types of Sun-path projections and the associated chart components.
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January 2023
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