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AstroCalc4R : software to calculate solar zenith angle ; time at sunrise, local noon, and sunset ; and photosynthetically available radiation based on date, time, and location / by Larry Jacobson, Alan Seaver, and Jiashen Tang.

Lawrence D. Jacobson [creator] Alan Seaver [creator]

Woods Hole, Mass. : U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Northeast Fisheries Science Center 2011

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