This tool lets you calculate and visualize the extent to which direct sunlight penetrates into the interior of a room through a vertical window. Please read the important instructions, notes, and FAQ pages before using this tool.
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The author maintains a private mailing list of users of the SunAngle suite of solar design tools, and is happy to send you very occasional notices about software upgrades and other items of interest. Such notices do not typically occur more frequently than a few times a year.