I cant find my book that has tons of info about the Dogon but heres what I can remember.

The in one of the Dogon Legends its says that the Dogon noticed Sirius A and from watching it they found Siruis B but then Siruis A disappeared and many years later it would reappear. They were "visited" by the Nommos who were more fishlike than human, and had to live in water.(strange I know)

Here we go anything thats inna book has to be on the internet.

The Dogon tells the legend of the Nommos, awful-looking beings who arrived in a vessel along with fire and thunder.

After they arrived here - they put out a reservoir of water onto the Earth then dove into the water.

There are references in the oral traditions, drawings and cuneiform tablets of the Dogons, to human looking beings who have feet but who are portrayed as having a large fish skin running down their bodies.

The Nommos were more fishlike than human, and had to live in water. They were saviors and spiritual guardians: "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."

The Nommo was crucified and resurrected and in the future will again visit the Earth, this time in human form. Later he will assume his amphibious form and will rule the world from the waters.

Dogon mythology is known only by a number of their priests, and is a complex system of knowledge. Such carefully guarded secrets would not be divulged to friendly strangers very easily. If the star Emme Ya is eventually discovered in the Sirius system, this would give considerably weight to the Dogon's story.

The Nommos, who could live on land but dwelled mostly in the sea, were part fish, like merfolk (mermaids and mermen).

Similar creatures have been noted in other ancient civilizations -- Sumer, Babylonia's Oannes, Acadia's Ea, Sumer's Enki, and Egypt's goddess Isis.

It was from the Nommos that the Dogon claimed their knowledge of the heavens.

The Dogon also claimed that a third star (Emme Ya) existed in the Sirius system. Larger and lighter than Sirius B, this star revolved around Sirius as well. And around it orbited a planet from which the Nommos came. (Sirius A).
Acccording to Robert Temple's Book The Sirius Mystery, the Dogon, a tribe of about 100,000 in western Africa, have had contact with extraterrestrials. One of Temple's main pieces of evidence is the tribe's alleged knowledge of Sirius B, a companion to the star Sirius. The Dogon are supposed to know that Sirius B orbits Sirius and that a complete orbit takes fifty years. One of the pieces of evidence Temple cites is a sand picture made by the Dogon to explain their beliefs. There are a number of other astronomical beliefs held by the Dogon which are curious; e.g., traditional belief in a heliocentric system and elliptical orbits of astronomical phenomena; knowledge of satellites of Jupiter and rings of Saturn, among other things. Where did they get this knowledge, if not from extraterrestrial visitors? They don't have telescopes or other scientific equipment, so how could they get this knowledge?

Carl Sagan concludes that the Dogon could not have acquired their knowledge without contact with an advanced technological civilisation. He suggests, however, that that civilisation was terrestrial rather than extraterrestrial. Western Africa has had many visitors from technological societies located on planet Earth. The Dogon have a traditional interest in the sky and astronomical phenomena. As Sagan notes, if a European had visited the Dogon in the 1920s and 1930s, conversation would likely have turned to astronomical matters, including Sirius, the brightest star in the sky and the centre of Dogon mythology.

Furthermore, there had been a good amount of discussion of Sirius in the scientific press in the '20s so that by the time Griaule arrived, the Dogon may have had a grounding in 20th Century technological matters beyond their understanding brought to them by visitors from other parts of Earth and transmitted in conversation. (Sagan notes that some of the discussion of the day involved the nature of white dwarfs, for example. Sirius B is a white dwarf, an extremely dense star, e.g., about a tonne to the cubic inch.)

Chronologically, the earliest of these amphibious entities would appear to be the Babylonian fish-people. They were known to the Babylonians as the Annedoti, which translates as 'repulsive', but notwithstanding their unappealing appearance they were sufficiently influential for the Babylonians to accept their teachings and acquire from them the fundamental tenets of civilisation. The most august member of the Annedoti was Oannes, portrayed in ancient Babylonian depictions as a curious, complex hybrid of human and fish, with a bearded man's head beneath the head of a fish, and the body of a fish borne upon the back of a man's body.

According to Babylonian legends, this aquatic deity would come on land during the day to teach the people, and would dive back at night into the Persian Gulf, where he lived in an underwater palace called the Apsu. Was Oannes the original Nommo?

Equivalent to Oannes in the religion of the Philistines at Philistia (in what is now Israel) was a human-bodied, fish-tailed deity called Dagon. Further to the west, Pharos in northern Egypt was said to be the home of 'the Old Man of the Sea' ­ a shape-shifting amphibious deity known as Proteus, son of Oceanus and renowned among the ancient Greeks as an oracle. Significantly, their traditional legends specifically claimed that he often sheltered in a cave to avoid the heat of Sirius.

I smell something "fishy" here isn't Jesus symbolized by the fish and crucified?

PICES (Fishes--Deliverance out of Bondage)
The ShuVaH or RETURN of the Holy Israel (at the end of the Churches Era)--the Current Messianic (Jewish-Christian) Movement (Psalms 102:13 and Romans 11:18-25)

Like Disciple says connect the dots.