Calculation Service
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Declination Calculator for the International Geomagnetic Reference Field IGRF
The declination calculator provides declination values for any location on Earth and any time between 1900 and 2025. The calculation is based on the International Geomagentic Reference Field (IGRF) which describes the geomagnetic core field. The cal…
ICGEM - International Centre for Global Earth Models
The determination of Earth’s global gravity field is one of the main tasks of geodesy: it serves as a reference for geodesy itself and provides essential information about the Earth, its interior and its fluid envelope for all geosciences. Thus, it …