Wheel In The Sky

What is the meaning of ezekiel's wheel within a wheel vision? There are only two old testament scriptures that directly reference this strange heavenly vision of a "wheel within a wheel". How many of all the righteous angels in existence were allowed to show themselves in the sky above bethlehem?

Vision of god's throne in his first vision from god, known as the "wheel in the middle of a wheel" vision, the prophet ezekiel compares the glory of god to a rainbow appearing in a cloud.