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Harpalus was an ancient Greek astronomer (flor. 82nd Olympiad, ca.450 BC) who corrected the cycle of Cleostratus and invented the Nine Year Cycle. He may also have been the engineer Harpalus who designed a pontoon bridge solution when Xerxes wished his army to cross the Hellespont.〔According to Hugh Pembroke Vowles. See Harpalus (engineer) for context.〕 ==References== * Historical, genealogical, and classical dictionary By Historical, genealogical and classical dictionary (Harpalus ) (1743) * The Origin of the History of Science in Classical Antiquity (Peripatoi 19) (Hardcover) by Leonid Zhmud page 270 ISBN 3-11-017966-0 (2006) * Handbuch der Altertumswissenschaft: calendars and years in classical antiquity By Walter Otto, Iwan von Müller, Hermann Bengtson, Alan E. Samuel (Page 39 ) ISBN 978-3-406-03348-3 (1972) ;Footnotes 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Harpalus (astronomer)」の詳細全文を読む スポンサード リンク
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