Sundials are usually labelled using Roman numerals, so the X would represent 10 o'clock.
As sundials tend to work best with sunlight, 10pm would be dark, so the X would represent 10am.
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They refer to the time - in hours. The slanted edge of the gnomon casts a shadow on the sundial at the position which represents the time.
using a sundial
The sundial
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It means 12 months of recovery.