Marine Sextant S-1847 — MYSIMULATOR

01 / PRECISION OPTICAL INSTRUMENTWEBGL2 · REAL-TIMEDRAG TO ORBIT · SCROLL TO ZOOM · ADJUST THE INDEX ARM USING THE CONTROL PANEL

01 / THE INSTRUMENT

Capture the horizon.

An artist's reconstruction of a 19th-century-style marine sextant. The engraved 0–120° scale uses the law of double reflection: a 1° change in mirror orientation changes the optical angle by 2°.

02 / INDEX ARM

46.0°OBSERVED ANGLE

0°60°120°

Physical mirror rotation23.0°Reflection amplification2 ×Scale interval0.5° arc / 1° reading

03 / SUNSHADE TURRET

The three optical filter carriers rotate together on their common brass spindle. These are visual shade selections, not a physical sunlight-transmission calculation.

04 / GEOMETRIC OPTICS

Incoming ray Reflected ray

For a plane mirror, the reflected ray rotates through twice the mirror's angular change. This interactive diagram is idealised; it is not a full ray-tracing of the telescope.

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