There is another reason Nibiru doesn't make sense.
Johannes Kepler was a famous astronomer who worked in the field around 400 years ago. He had many years of precise observations of the planets to work from and was the first astronomer to understand the true orbits of the planets (that they were not circles but ellipses). He wrote 3 laws of planetary motion that were proven correct, and are still used today.
The third law goes as follows: The square of a planets orbital period is proportional to the cube of it's semi-major (longest) axis. This law works for everything from dust particles orbiting the sun up to the largest planets. Moons follow this law as well, and man-made space craft are guided to their destinations in the solar system using this law.
So we already know the orbital period of Nibiru, therefore we can work out its semi-major axis. Once we know that we can then work out it's velocity and where it is now. I don't have the math for you but this was used to debunk Nibiru back in 2002 (it was supposed to hit in 03) A year before it was due to hit - Nibiru was calculated to be at a distance of 900 million km from earth. So, just roughly, times by 4, and Nibiru is only 3.6 billion km away now. That is well within our solar system. I've said before we would already see it ourselves. You wouldnt need a telescope at all.
So the reason I and others like teosophia have said that Nibiru must be traveling millions of km every hour - is because WE ARE NOT SEEING IT, and that orbital velocity is IMPOSSIBLE because its way, way, way above escape velocity. Escape velocity - point of no return - too much mass - impossible orbit.
It cant be hiding behind the sun, because we are rotating around it and will do so 4 bloody times between now and then. Its not coming from the south pole because anybody with a telescope say 25 degrees south of the equator has a birds eye view of the south celestial pole (I am one of them and i own a 12'' telescope)
And it cant be coming from anywhere else because of the same reason - we would see it.

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