Text: "A protracted twilight." A long-lasting solar halo was seen on the forenoon and afternoon of June 30, and another on July 1, 1908. Probably associated with the Tunguska event of 1908. Observatory. 31, 1908. p. 325.

See Also: Scalar electromagnetics, natural scalar interferometry, anomalous light phenomena, electromagnetic anomalies, Tunguska incident.

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