why does the portable sundial need compass
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The introduction of a compass makes the pocket sundial more accurate as it does not require the user to know whether the hour is before or after noon. In a compass dial, the sundial's plate is reduced to the outer ring to allow the compass card and needle to be read through the centre.
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The introduction of a compass makes the pocket sundial more accurate as it does not require the user to know whether the hour is before or after noon. In a compass dial, the sundial's plate is reduced to the outer ring to allow the compass card and needle to be read through the centre.
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