How can the parallax error be defined?
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Parallax error. An error that occurs when the position of an object appears to differ when viewed from different angles, causing a misinterpretation of its true position or measurement.
Cockpit instruments typically consist of a scale or dial with a pointer that indicates a value (such as altitude, airspeed, or heading). The scale is often behind a transparent cover or glass. When a pilot looks at an instrument, they do so from a specific angle or position within the cockpit. If the pilot's line of sight is not directly perpendicular to the scale or pointer, the pointer may appear to be at a slightly different position than it actually is. This angle difference causes a displacement between where the pointer appears to be and its actual position on the scale. This displacement is known as parallax error.
- In the context of instrument readings, parallax error can occur if the pilot's line of sight to an instrument is not directly perpendicular to the scale or pointer. This can lead to inaccurate readings of altitude, speed, or other parameters crucial for flight.
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