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Northeast Fisheries Science Center Reference Document 11-14

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
NOAA National Marine Fisheries Service, Northeast Fisheries Science Center, 166 Water Street, Woods Hole, MA 02543

Web version posted October 14, 2011

Citation: Jacobson L, Seaver A, Tang J. 2011. AstroCalc4R: software to calculate solar zenith angle; time at sunrise, local noon and sunset; and photosynthetically available radiation based on date, time and location. US Dept Commer, Northeast Fish Sci Cent Ref Doc. 11-14; 10 p. Available from: National Marine Fisheries Service, 166 Water Street, Woods Hole, MA 02543-1026, or online at

Information Quality Act Compliance: In accordance with section 515 of Public Law 106-554, the Northeast Fisheries Science Center completed both technical and policy reviews for this report. These predissemination reviews are on file at the NEFSC Editorial Office.

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