The Dogon Tribe lives in the Homburi Mountains near Timbuktu in the southwestern portion of the Sahara Desert in Africa. Central to their religious teachings is knowledge about the Sirius star system, which includes a star which is invisible to the naked eye and, in fact, so difficult to observe — even through a telescope — that no known photographs were taken of it until 1970. The Dogon, however, do no claim a superior technology, but say they received their knowledge by visitors to the earth from another star system.
the star the Dogon described is Sirius B, apparently a white dwarf star. Astronomers of the Modern breed had begun to suspect something as early as 1844, based on irregularities in the movement of Sirius A. By 1862, a faint companion star was finally detected, and it was assumed that its extreme density and heaviness was sufficient to exert an influence on Sirius A.
Long before this, of course, The Dogon had already named Sirius B, “Po Tolo”, a name which includes the word for star (tolo) and “po”, the name of the smallest seed known to them. They had in fact described the star’s size by noting that it was, “the smallest thing there is.” They also had recognized that it was both white and “the heaviest star”.
The Dogon were also able to describe its elliptical orbit with Sirius A at one foci of the ellipse (an accurate description), its orbital period of 50 years (the actual figure is 50.04 +/- 0.09 years), and the fact the star rotated on its own axis (it does). Significantly, The Dogon also described a third star in the Sirius system, which they called “Emme Ya” (“Sorghum Female”), and which contained a single satellite in orbit around Emme.
The Dogon idea of their being a Sirius C, aka Emme Ya, was not accorded any real respect until 1995, when two French Astronomers published their results, after years of study, of what was apparently a small, red-dwarf star within the Sirius star system  The conclusion was based on perturbations in the orbits that could not be explained by any other means.
Obviously, The Dogon are way ahead of modern astronomers!
In addition to the Sirius system, The Dogon mythology includes knowledge of Saturn’s rings and Jupiter’s four major moons (none of which can be seen by the naked eye and it was only by Galileo and later astronomer’s telescopes that either could be seen). The Dogon also have long known that planets orbit the sun.
According to The Dogon, their astronomical knowledge was supposedly given to them by the Nommos, amphibious beings sent to earth from Sirius for the benefit of mankind. The name comes from a Dogon word meaning “to make one drink”, with the Nommos also being called: “Masters of the Water”, the “Monitors”, and the “Teachers”.
The Nommos, considered to be saviors and spiritual guardians, were allegedly more fish like than human, and had to live in water. [Possibly, seeking a higher porpoise?] “The Nommo divided his body among men to feed them; that is why it is also said that as the universe ‘had drunk of his body,’ the Nommo also made men drink. He gave all his life principles to human beings.” According to The Dogon, the Nommo was crucified and resurrected and in the future will again visit the earth, this time in human form. Later he would assume his amphibious form and rule the world from the waters.
The Dogon mythology was known only by a number of their priests, and is considered to be a complex system of knowledge. Such carefully guarded secrets would not have been divulged to friendly strangers very easily. If the star, Emme Ya (Sirius C), is eventually discovered in the Sirius system, this would justify a serious investigation of The Dogon’s story, if only to determine the Sirius Connection.