Tordesillas, Jose ManuelPavón Carrasco, Francisco JavierAnquela, Ana Belén2024-06-072024-06-072024-01-11Tordesillas JM, Pavón-Carrasco FJ, Anquela AB. Reconstructing the Past of Magnetic Declination at the Real Observatorio de Madrid. En: IV Conference on Geomatics Engineering. MDPI; 2024. p. 21.10.3390/environsciproc2023028021https://hdl.handle.net/20.500.14352/1047672024 Descuento MDPIThe agonic line, characterized by zero values of geomagnetic declination, has had a westward drift during the last centuries, crossing the location of the Real Observatorio de Madrid at the end of the year 2021. This fact, which was monitored by the Instituto Geográfico Nacional, moves us to study the evolution of the magnetic declination in this emblematic emplacement between the last two crosses of the agonic line. Our results point out that the current westward drift started around the year 1810 and, before this period, the agonic line moved from west to east, crossing the location of the Real Observatorio around 1650–1675.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/conference paperhttps://doi.org/10.3390/environsciproc2023028021https://www.mdpi.com/2673-4931/28/1/21open access550.38GeomagnetismMagnetic declinationAgonic lineSecular variationGeofísica2507.01 Geomagnetismo y Prospección Magnética