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A large ring or thin section of a pipe that is either heavy or weighted at the bottom that can be used to measure the angular height of the sun throughout the day. With the handle at 000 and the weight at 180 on the dial, they have one slit at about 45° that casts the shadow onto the inside of the ring. the location of this shadow marks the height of the sun. See figure 11-16 in Emergency Navigation. Mariner's rings date from the 1400s in old navigation records.