The Celestial equator is an extension of the Earth's ????? .
It always intersects the observer's horizon directly through the ????? points.
For an observer at the North Pole or the South Pole, the Celestial Equator is the same as the observer's ?????.
The Celestial Equator passes directly through the observer's ?????? (a point on the observer's meridian) for an observer on Earth's equator.
