Question:
_____ measures the exact angles of stars, sun and moon above the horizon by the use of adjustable mirrors.
_____ measures the exact angles of stars, sun and moon above the horizon by the use of adjustable mirrors.
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A "Sextant" gets its name because its arc spans $60^{\circ}$, which is one-sixth of a full circle!
Updated On: Jun 29, 2026
- Sextant
- Compass
- Inclinometer
- Telescope
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The Correct Option is A
Solution and Explanation
Step 1: Concept
Historical navigation relied on celestial bodies to determine a ship's latitude and longitude on the open ocean.
Step 2: Meaning
A specific optical instrument is required to measure the angular distance between the horizon and a celestial body (like the sun or stars).
Step 3: Analysis
• A Compass indicates magnetic direction (North, South, East, West).
• An Inclinometer measures the angle of a slope or tilt relative to gravity.
• A Sextant is a specialized navigational instrument that uses a system of adjustable mirrors to precisely measure the angle of celestial bodies above the horizon, allowing sailors to calculate their latitude.
Step 4: Conclusion
The instrument defined by the use of mirrors to measure celestial angles is the sextant. Final Answer: (A)
Historical navigation relied on celestial bodies to determine a ship's latitude and longitude on the open ocean.
Step 2: Meaning
A specific optical instrument is required to measure the angular distance between the horizon and a celestial body (like the sun or stars).
Step 3: Analysis
• A Compass indicates magnetic direction (North, South, East, West).
• An Inclinometer measures the angle of a slope or tilt relative to gravity.
• A Sextant is a specialized navigational instrument that uses a system of adjustable mirrors to precisely measure the angle of celestial bodies above the horizon, allowing sailors to calculate their latitude.
Step 4: Conclusion
The instrument defined by the use of mirrors to measure celestial angles is the sextant. Final Answer: (A)
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