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Retroworks OriginalAquitaine Sundial RingThis ring is based on the original sundial ring Queen Eleanor gave to her husband, Henry II of England in about 1152.On a cloudless day, hold the ring upright aligning one of the 3 reference lines straight up. Rotate the sun dial until the hole is next to the current date (month of the year and beginning/middle/end of the month)A beam of light illuminates the time on an inside clock scale.Calibrate by using the reference line that works with your latitude - northern cities will use a different line than southern ones. The 3 reference lines allow Daylight Savings Time adjustments as well.Made from VERY durable stainless steel, acid etched markings.This ring is a size 10. It can also be worn on a chain as a necklace (chain not included in purchase)