1580s BC

Millennium:	2nd millennium BC
Centuries:	17th century BC 16th century BC 15th century BC
Decades:	1600s BC 1590s BC 1580s BC 1570s BC 1560s BC
Years:	1589 BC 1588 BC 1587 BC 1586 BC 1585 BC 1584 BC 1583 BC 1582 BC 1581 BC 1580 BC
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The Egyptians invented a new and better calendar. It is based on both the moon and a star. They observed the annual appearance of the brightest star in the sky, Sirius. This calendar was more advanced than the Babylonian calendar.

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