isohel

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isohel

a line on a map connecting places with an equal period of sunshine
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

isohel

[′ī·sō‚hel]
(meteorology)
A line drawn through geographical points having the same duration of sunshine (or other function of solar radiation) during any specified time period.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.