This magnitude value was reached at geographic coordinates 80.815\({}^{\circ}\)N, and 66.78\({}^{\circ}\)W, at 10:41:57 UT (Greatest Eclipse time, GE time, [[http://xjubier.free.fr/en/site_pages/solar_eclipses/ASE_2021_GoogleMapFull.html](http://xjubier.free.fr/en/site_pages/solar_eclipses/ASE_2021_GoogleMapFull.html)]([http://xjubier.free.fr/en/site_pages/solar_eclipses/ASE_2021_GoogleMapFull.html](http://xjubier.free.fr/en/site_pages/solar_eclipses/ASE_2021_GoogleMapFull.html)), last accessed on 15 June 2022). The paths at ground level and at 350 km of altitude of the annular eclipse are shown in Figure 1 (see Supplementary Materials, Video S1). Due to the specific geometry of each eclipse, the paths differ both geographically and temporally according to the height considered, which could be significant when analyzing them [21]. Solar eclipses are rare events and, particularly, the 10 June 2021 event is an excellent opportunity to study the eclipse-induced effects on the polar ionosphere. Since the ionospheric variations can perturb GNSS, the eclipse can be used to study the positioning errors in these regions. There are some studies on the effects of the ionosphere during solar eclipses over the northern polar region. One of the first reported ones was the total solar eclipse that occurred on 9 March 1997 over Kazakhstan, Mongolia, eastern Siberia, and the Arctic Ocean (\(\tau=-26\) to 180 min and A = \(-5\) TECu) [4; 22]. Another reported one is the total solar eclipse that occurred on 1 August 2008 over Canada, northern Greenland, the Arctic Ocean, central Russia, Mongolia, and China (\(\tau=-27\) to 44 min, and A[%] = \(-40\) to \(-11\%\)) [10]. The most recent one is the eclipse that occurred on 20 March 2015 that covered the North Atlantic, Faroe Islands, and Svalbard (A[%] = \(-50\) to \(-10\%\)) [5; 23]. This last one happened during the recovery phase of the most intense geomagnetic storm during Solar Cycle 24, the so-called St. Patrick's Day Storm. Due to the limited availability of GNSS stations around the globe at the time of these previous studies, they were focused on a regional scale. The increasing number of accessible GNSS stations around the world allows a study on a global scale, facilitating the search of potential interactions between regions. This can show how spreadable GNSS disturbances are. In particular, the poles are of interest since several ionospheric disturbances can start from there during geomagnetic storms. In GNSS receivers, TEC is estimated simultaneously from several satellites of the network, which serves to study the ionosphere. (e.g., [4; 8; 24], among many others). During the eclipses, the ionization decreases, producing a depletion in TEC. Although a decrease in electron concentration during a solar eclipse could produce an improvement in the positioning precision, it actually generates positional errors [25; 26]. Few authors have analyzed the GNSS positioning errors caused by the influence of solar eclipses. The eclipses that occurred over Croatia on 11 August 1999 [27], over China on 22 July 2009 [28], and over the United States on 21 August 2017 [26] are some of the studies that analyzed GNSS positioning errors. For the 1999 solar eclipse, [PERSON], et al. [27] used a single frequency receiver located in the north of Croatia with \(\sim\)95% of maximum percentage of obscuration (MPO). In this work the authors did not relate ionospheric disturbances with positioning variations. The authors collected the horizontal positioning at the eclipse's maximum obscuration time (MOT). They calculated an average positioning error of \(\sim\)34 m on horizontal Global Positioning System (GPS) accuracy for that time. These horizontal values could be due to the use of a single-frequency, the number of receiver channels, and the possible influence of Selective Availability (until May 2000). [PERSON] et al. [28] used eight GPS stations to study the TEC changes and their effect on the positioning during the 22 July 2009 solar eclipse.