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The sun's elevation is indicated by the position of anodus, either the shadow-tip of a gnomon, or a spot of light.
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The time is read from where thenodusfalls on a set of hour-curves that vary with the time of year.
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Anodusis formed where the second main vein (subcosta) meets the leading edge of the wing.
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Nodus-based sundials may use a small hole or mirror to isolate a single ray of light; the former are sometimes called "aperture dials".
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The mirror acts like anodus, casting a single spot of light on the ceiling.
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The tip of the pointer serves as thenodus; the height of thenodus-shadow within the bowl gives the time of the year.
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With a knot or bead on the string as anodus, and the correct markings, a diptych (really any sundial large enough) can keep a calendar well-enough to plant crops.
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