TWILIGHT.
"The effect called 'twilight,' is one of the further results of the atmospheric envelope which surrounds our globe. Tlie next factor is tho amount of moisture present in the air at a given. Bpot. Hence it arises that although the twilight as a general rule is said to last until the sun has sunk--18 degrees below the horison, yet this amount may be increased to 20 degrees ai*d more by the moist atmosphere of an insular position, such as is occupied by Great Britain, or decreased to 16 degrees or less by a dry*air, such as prevails in the desert of' Sahara or in Central Asia. The duration; of twilight is also dependent on the latitude of the place of observation, and varies from about seventy minutes at the equator to just over two hours in latitude 50 degrees. It is desirable to add that in the latitude of London, from May 26th to July 20th, twilight lasts throughout the night." From "Fireside Astronomy," by D. W. Homer, F.R. Sfet. Soc.
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Bibliographic details
Press, Volume LXII, Issue 12129, 27 February 1905, Page 8
Word Count
172TWILIGHT. Press, Volume LXII, Issue 12129, 27 February 1905, Page 8
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