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that at its simplest is a vertical line on a south facing wall or a north-south line on a horizontal pavement. When the shadow of a point (or a projected image of the Sun) crosses the line it will be midday. Noon in local standard time is defined as when the sun is overhead, however clocks and
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Slightly amended reprint of the 1970 translation published by
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watches use mean time which varies from standard time by a few minutes each day. The difference is calculated using the
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and this can be shown on the noon mark by drawing an
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105:"Theorie einer Bifilar-Sonnenuhr"
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128:Rohr, R. R. J. (1996).
202:-related article is a
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