“A red cross appeared in the sky” and other celestial signs: Presumable European aurorae in the mid AD 770s were halo displays

Publisher: John Wiley & Sons Inc

E-ISSN: 1521-3994|336|10|913-929

ISSN: 0004-6337

Source: ASTRONOMISCHE NACHRICHTEN, Vol.336, Iss.10, 2015-12, pp. : 913-929

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Abstract