磁気偏角
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定義
ある地点における真北（地理的北）と磁北との間の角度で、東または西の度数で表される。
解説
Earth's magnetic north pole does not coincide with its geographic north pole, causing compasses to deviate from true north by an amount that varies by location and changes over time. In 2024, magnetic declination in London is approximately 0°, while in Los Angeles it is about −11° (west). Hikers, pilots, and surveyors must apply this correction to convert compass readings into accurate true bearings.
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