Harpalus (astronomer)
Encyclopedia
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.
450 BC
Year 450 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Second year of the decemviri...
) who corrected the cycle of Cleostratus
Cleostratus
Cleostratus was an astronomer of ancient Greece. He was a native of Tenedos, and the Chaldean astronomer Naburimannu may have been a contemporary of him. He is believed by some scholars to have introduced the zodiac and the solar calendar to Greece from Babylonia. Censorinus Cleostratus (ca....
and invented the Nine Year Cycle. He may also have been the engineer Harpalus
Harpalus (engineer)
Harpalus or Harpalos is a name reported by modern historical books as the engineer who built the pontoon bridge over the Hellespont for Xerxes in 480 BC...
who designed a pontoon bridge
Pontoon bridge
A pontoon bridge or floating bridge is a bridge that floats on water and in which barge- or boat-like pontoons support the bridge deck and its dynamic loads. While pontoon bridges are usually temporary structures, some are used for long periods of time...
solution when Xerxes
Xerxes
Xerxes is a male name. Most notably, it may refer to Xerxes I of Persia . It may also refer to:-People:*Xerxes II of Persia, reigned 424 BCE*Xerxes of Armenia, Armenian king, assassinated around 212 BCE...
wished his army to cross the Hellespont.