Hemisferium H21 Nautical Instruments
Astronomical Ring Dial
Although known as the Astronomical Ring, its fundamental principle is that of the Universal Solar Equatorial Quadrant. Its use was generalized during century XVIII. It is composed of a ring adjustable for several latitudes, a meridian ring with latitude scale, a folding hourly ring and a slotted central rule, with the graduation of the months, on which a small perforated cylinder moves. The time obtained is the local solar.

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