Hello Bryan, I make horizontal sundials, and for many years Waugh has been my inspiration and bible, too. Based on his book, I made the attached spreadsheet which has served me well. A long time ago (cells L1:V222) I applied his formulae step by step. Welcome to use it. Call me if you are interested in mean time version and/or declination lines. Best regards, Cormac Lalor Cork.
LAT - Hour Angles.xlsx
Description: MS-Excel 2007 spreadsheet
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