id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_za6427rjjjepniqwavonrndflm	Mioara Mandea	After some 350 years – zero declination again in Paris	2016	5	.pdf	application/pdf	3940	323	62	an updated series of geomagnetic declination in Paris, shortly after a very special occasion: its value has reached Observing the Earth's magnetic field, since the time of the and these data represent the most important body of measurements to analyse the time evolution of the field morphology. Measurements of the Earth's magnetic field have been taken The oldest declination value given by a magnetic compass known to us is dated 1451. declination with time (i.e. secular variation) is generally assumed to have taken place only in the early 17th century. From the 17th century, declination and inclination measurements started to be made on a more regular basis, giving the direction of the local geomagnetic vector, more or Paris declination series: annual means of declination corrected and adjusted to Chambon la Forêt observatory (see Alexandrescu et al., 1996, for details) The annual means of declination (1541–2015), adjusted to the Chambon la Forêt observatory, are presented in Fig. 1.	./cache/work_za6427rjjjepniqwavonrndflm.pdf	./txt/work_za6427rjjjepniqwavonrndflm.txt