Image: Hours of daylight vs latitude vs day of year cmglee
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Description: A contour plot of the hours of daylight as a function of latitude and day of the year, using the most accurate models described in Sunrise equation, based on http://commons.wikimedia.org/wiki/File:Hours_of_daylight_vs_latitude_vs_day_of_year.svg . Latitude 40° N (approximately New York City, Madrid and Beijing) is highlighted for reference.
Author: Cmglee
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC-BY-SA-3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
Attribution Required?: Yes
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