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(美国英语). What is Earth's Axial Tilt? - Universe Today. 2016-07-27 [2016-08-19]. (原始内容存档于2016-08-23) (美国英语). Burn, Chris. The Polar Night (PDF). The Aurora
281-289, 1954. Gideon, D. N., A. T. Hopper, and R. E. Thompson, "Earth current effects on buried pipelines : analysis of observations of telluric gradients