From what location on Earth is the celestial equator not visible?

Question

I know the north celestial pole is not visible to anyone south of the equator and the south celestial pole is not visible to anyone north of the equator...but what about the celestial equator?

I'm having a tough time with my Astronomy homework..even though I really like the subject. Help please!

Answer 1

The celestial equator is theoretically visible from everywhere. From the north or south poles, it would be on the horizon, but atmospheric refraction raises objects on the horizon by about half a degree, so with the help of refraction, a star exactly on the celestial equator would be just visible.

Answer 2

Indoors.  In a cave.  In a valley (depends on how high the hills and mountains are, and how far north or south you are).

Or: everywhere.  The celestial equator is an imaginary, invisible construct.  There is no "line in the sky" to mark it.

Answer 3

If you're at the north or south pole on the Earth, the celestial equator will be along the horizon, so a star on the celestial equator would be right on the horizon and not visible.