An antique Navy navigation brass compass with a sundial shows the exact astronomical time. To more accurately determine the time, you should raise the round dial at noon perpendicular to the sunlight. The hours are conventionally designated at each degree of latitude and change by the whole hour when moving from east to west. A sundial allows you to determine this exact time, which is essential for navigation. Adjustable legs and liquid level ensure the dial is sitting flat on uneven surfaces. The compass is made for the northern hemisphere. Marked, West London, on the top. Circa: early 20th century. Antique Marine Nautical Collectibles And Naval Accessories.