Auroras may be seen on most of the clear nights of the year. The month
of June is, on account of its light nights, the only month in which an
aurora is not observable.
AURORAS.
Ethnology of the Ungava District, Hudson Bay Territory Eleventh Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1889-1890, Government Printing Office, Washington, 1894, pages 159-350 · 第 10 / 70 题