Function and positioning of a portable sundial
1. It was important to ensure that the clock is arranged on absolutely horizontal ground
2. The sundial was placed in a position so that the vertical block cast its shadow precisely on the diagonal slope of the clock, and not to either side.
The scale, marked as diagonal lines on the sloping surface, was differentiated by vertical lines, forming one vertical zone for each month or a season of the year, so that it was possible to read off the correct time for the relevant period.
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