Discover the crucial difference between true north and magnetic north with our Magnetic Declination Calculator. Essential for navigation, surveying, and aviation, this tool helps you determine the precise magnetic declination for any location and date using advanced geomagnetic models.
Formula:
Magnetic Declination (D) is the angle between true north (geographic north) and magnetic north (the direction a compass needle points). It varies significantly by location and changes over time, influenced by Earth's dynamic magnetic field.
Our calculator approximates D based on your provided geographical and temporal inputs. Precise calculations typically rely on complex geomagnetic field models (like the World Magnetic Model - WMM, or International Geomagnetic Reference Field - IGRF), which account for the Earth's core, mantle, and crustal fields.
- Latitude (φ): Geographic latitude in decimal degrees (-90 to +90).
- Longitude (λ): Geographic longitude in decimal degrees (-180 to +180).
- Year: The specific year for which the declination is needed (e.g., 2024).
The declination result indicates the angle in degrees East (+) or West (-) of true north.