Again, the Sumero-Akkadian cuneiform texts present a confusing portrait of Nibiru. How can something represent a "crossing" or "dividing" point and be a star, a god, and either Jupiter [Marduk] or Mercury or BOTH?Again, the Sumero-Akkadian cuneiform texts present a confusing portrait of Nibiru. How can something represent a "crossing" or "dividing" point and be a star, a god, and either Jupiter [Marduk] or Mercury or BOTH?
The term Niburu (Neberu, Nebru) with the meaning of "a crossing place" came to be associated with a couple of planets because the Sumerians were observant of the sky and noted that planets, and the Sun and stars, migrated north and south over the period of a year. They didn't know that this was because of the Earth's axial tilt, but they observed the fact.
The "high point" (Northernmost) that these bodies reached, the point where they seem to "turn around" and head back south is related to the idea of a crossing place in that, once the planet reached that point, it's journey "crossed" into the opposite direction.
The planets were of particular importance to ancient astronomers. They had no real idea what they were, but they could easily see that they moved differently than the stars. They thought stars and planets were the same thing because they look like the same thing. The planets move around in other ways in the sky other than north-south, so they considered them quite special, even associating them with their gods. Babylonians eventually came to view Marduk as their only god (all the others had been different aspects of Marduk all along, they surmised.) Marduk was associated with Jupiter. The place where Jupiter stopped and began heading south was a nibiru to them.
99% of the uses of the term Nibiru in Mesopotamian writings involve the city of the same name - a city they believe was built by the god Enlil. That city still exists today. It later became known by the name Nippur, and today is called Nuffar. Nippur was located on the Euphrates river, no doubt at a crossing, hence it's early name.