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Place the sundial compass on a level surface. Flip the gnomon up and lock it into place. The gnomon is used to cast the shadow from the sun so you can determine the time of day.Adjust the gnomon until the tip points in the same direction as north based on your compass. The sundial will not tell the correct time unless the gnomon is facing north.Locate the shadow that is cast on the rim of your sundial. Times are written all around the sundial. Wherever the shadow is cast on the rim, that is roughly the time of day.