Reading the ANUNNAKI CHRONICLES, we are often referred to the tablets used in Mesopotamia over 6000 years ago.
One can really understand what Zecharia Sitchin had accomplished, when one knows more about these ancient tablets, he based most of his work on.
The tablets were written in cuneiform. Cuneiform is a system of writing, first developed by the ancient Sumerians in southern Mesopotamia (today Iraq) 3500 BCE. The word comes from the Latin word cuneus for ‘wedge’. A stylus is pressed into soft clay, stone or bone to produce wedge-like impressions.
Thousands of clay tablets are only as big so they could fit into the hand of the scribe.
It is considered the most significant cultural contributions of the Sumerians to introduce writing, or better be introduced (by the “gods”) to writing. This was necessary to manage the many city states like Eridu or Uruk with a complex Life. Administrations, music, culture, organized labor, book keeping of food sources had to be counted for, but also perfume making, witchcraft and homework assignments were found on the tablets.
The earliest cuneiform tablets were pictorial: a king, a battle, a flood. They became more complex and more intangible (like the will of the gods, the quest for immortality). By 3000 BCE the stylus conveyed word-concepts (honour). Cylinder form was another highly useful way to inscribe information. The completed small round shaped cylinder form tablet was then pressed upon a stone to picture the complete drawing.

The first translation of a cuneiform writing was presented in 1837 in England. Until then the Bible was always seen as the first original writing. Yet they discovered that the stories of the bible in Genesis had its source in the ancient texts on the cuneiform tablets about The Fall of Man and The Great Flood, The Epos of Gilgamesh from Mesopotamian myths and many more.
Zecharia Sitchin was one of the handful of scholars who were able to decipher the tablets around 1900.
He had to decipher many, many tablets again, as for him this was not myth but real Ancient history. The texts wedged into the clay or stone tablets praised real Beings. The instructions on the tablets for building the temple tower (the home of the city god, called ziggurats) were given by real, powerful beings: the Annunaki, seen as Gods by the people.

There are a number of problems associated with reading cuneiform writing, e.g. interpreting the handwriting of the individual scribe or deciphering the signs on a tablet in poor condition.
The main problem, however, when transliterating cuneiform signs is their multiple meaning. Just like a word in English can have more than one meaning, e.g. ‘might’, so can a Sumerian sign. = UD can stand for ‘sun’, ‘day’, ‘storm’, ‘white’, and ‘to shine’. In Sumerian, as in English, the context will decide the meaning. However, the more meaning potential a word or sign has, the more difficult it is to assign the correct interpretation.
The sign AN (depending on context) can stand for AN “sky” or DiGIR/DINGIR “god”. Zecharia Sitchin spent 30 years of his Life deciphering and re-interpreting these tablets into a new context about the AN NU NA KI, those who came from the Sky.