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The Star Qohob, also known as the Guardian of the Pole, was the closest star to a North Star during Plato's time. The Greeks, especially during the Classical and Hellenistic periods, were interested in astronomy and had astronomers like Hipparchus and Ptolemy who made significant contributions. They used their celestial knowledge practically, such as creating accurate calendars for agriculture and religion. The Star Qohob was the closest to a North Star at the time of Plato around 400 BC. It was also known to them as the Guardian of the Pole. The Greeks, particularly in the Classical and Hellenistic periods, were keen observers of the night sky. It was the work of astronomers such as Hipparchus and Ptolemy that truly propelled Greek astronomy. The Greeks' fascination with astronomy wasn't solely theoretical. They also applied their celestial knowledge in practical ways such as developing accurate calendars for agricultural and religious purposes.