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Magnetic Declination Formula:
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Magnetic declination (also known as magnetic variation) is the angle between magnetic north and true north. This angle varies depending on your position on the Earth's surface and changes over time.
The calculator uses the magnetic declination formula:
Where:
Explanation: The arctangent function calculates the angle whose tangent is the ratio of Y to X components of the Earth's magnetic field.
Details: Accurate magnetic declination calculation is crucial for navigation, surveying, and mapping applications. It ensures proper alignment between compass readings and true geographic directions.
Tips: Enter the Y and X components of the magnetic field in nanoteslas (nT). The X component cannot be zero as division by zero is undefined.
Q1: Why is magnetic declination important for navigation?
A: Magnetic declination correction ensures that compass readings accurately point to true north, which is essential for precise navigation and orientation.
Q2: Does magnetic declination change over time?
A: Yes, magnetic declination changes gradually over time due to shifts in the Earth's magnetic field. Maps and navigation systems need regular updates.
Q3: How does location affect magnetic declination?
A: Magnetic declination varies significantly with geographic location. The angle can be east or west of true north depending on where you are on Earth.
Q4: What's the difference between magnetic north and true north?
A: True north is the direction toward the geographic North Pole, while magnetic north is the direction a compass points toward the magnetic North Pole.
Q5: Can I use this calculation for any location?
A: This formula provides the basic mathematical relationship, but for practical applications, you should use region-specific magnetic models that account for local variations.