On that day, a pregnant woman, "clothed with the sun", will appear in the sky with the "moon under her feet", and a "crown of 12 stars on her head".
According to Meade, who says he studied astronomy at an unspecified university in Kentucky, the great change in our world will be the result of the arrival of Nibiru, a planet famous in conspiracy circles but which astronomers say doesn't exist.
"The possibility of a new planet is certainly an exciting one for me as a planetary scientist and for all of us", said Mr Green.
The main purveyor of the outrageous claim is Christian numerologist David Meade, who believes that Nibiru will arrive to fulfil the biblical Book of Revelations.
Meade calculated its arrival by linking the phenomenon to the solar eclipse that took place on August 21.
"The story started with claims that Nibiru, a supposed planet discovered by the Sumerians, is headed toward Earth", NASA explained.
The end of the world is said to be coming on Saturday, but don't cancel your plans just yet. And the child is the planet Jupiter, which will be moving out of Virgo on that night as though she is giving birth.
"Jesus lived for 33 years".
Believers are certain that Planet X is real and heading Earthwards - although Christian conspiracy theorists don't exactly have the best track record. "The name Elohim, which is the name of God to the Jews, was mentioned 33 times [in the Bible]", Meade told The Washington Post. In an interview with our publication, David Morrison, then the senior scientist at the Astrobiology Institute at NASA Ames Research Center, calmly squashed any such arguments. "It's a very biblically significant, numerologically significant number".
As the horror of these rumors spreads rapidly, NASA has rushed to clarify that the rumored planet X does not exist, although astronomers have detected at the end of our planetary system a unusual planet four times larger than earth.
"This catastrophe was initially predicted for May 2003, but when nothing happened the doomsday date was moved forward to December 2012 and linked to the end of one of the cycles in the ancient Mayan calendar at the winter solstice in 2012", say Nasa.