The Dogon seem to possess advanced astronomical knowledge. The Dogon's system reveals precise knowledge of cosmological facts only known since the development of modern astronomy. They believe that the brightest star in the sky, Sirius (sigi tolo or 'star of the Sigui'), has two companion stars, pō tolo (the Digitaria star), and ęmmę ya tolo, (the female Sorghum star). They also appear to know that Sirius was part of a binary star system, whose second star, Sirius B (po tolo), which is imposible to see in the sky. And that it took 50 years to complete its orbit. In addition to their knowledge of Sirius B, the Dogon mythology includes Saturn's rings, and Jupiter's four major moons. They have four calendars, for the Sun, Moon, Sirius, and Venus, and have long known that planets orbit the sun.
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