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Angles of Illumination

Time, Illumination, and Latitude

“Angle of illumination” is the term used to describe the angle at which sunlight strikes a particular location on Earth. These angles change depending on where you stand on Earth’s surface, and when.

I used annual patterns of illumination at four distinct locations in Hawai’i, California, Oregon, and Alaska to visualize how sunlight intensity and length of day changes from hour to hour, and year to year:

Each image is composed of 288 shaded relief maps displaying light and shadows at a specific day and hour. 12 columns represents the 21st day of each month, and 24 rows represents each hour of a 24-hour day. The resulting grid of small maps visualize the natural patterns of illumination found at these different latitudes.