Locations along the equator are the only place on Earth where you can see the entire celestial sphere (during the day or night) over the course of 24 hours.

Question

Quizplus · Accepted Answer

This is because the equator is the only place on Earth where the celestial equator, which is the extension of the Earth's equator into the sky, passes directly overhead. This means that as the Earth rotates, every part of the sky is visible over a 24-hour period. In contrast, at the Earth's poles, only half of the celestial sphere is visible at any given time.

Locations Along the Equator Are the Only Place on Earth