NAUTICA

S–120 / PRECISION SEXTANT / 1897

INSTRUMENT LABORATORY · 01

Celestial sighting

Turn the index arm to match a celestial body with the sea horizon. The mirror rotates through half the indicated altitude—the real double-reflection principle of a sextant.

Observed altitude60.0°

0°60°120°

Index mirror rotation0.0°

OPTICAL ACCESSORIES

Telescope focusing ring0°

Drag to orbit · Scroll to zoom · Switch filters. Simulated angular kinematics, not a full ray-traced optical model.

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