Note 023
Sherefeddin only says (l. iii. c. 13) that the rays of the setting, and those of the rising sun, were scarcely separated by any interval; a problem which may be solved in the latitude of Moscow, (the 56th degree,) with the aid of the Aurora Borealis, and a long summer twilight. But a day of forty days (Khondemir apud D'Herbelot, p. 880) would rigorously confine us within the polar circle.

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The History Of The Decline And Fall Of The Roman Empire —Fall In The East —Chapter 65