The celestial equator is defined as the
A) line in the sky that is perpendicular to Earth's spin axis.
B) line traced in the sky by the Moon each month against the background stars.
C) line traced in the sky by the Sun over 1 year against the background stars.
D) band of constellations through which the Sun and Moon move in the sky.

Question

Quizplus · Accepted Answer

The celestial equator is an imaginary line in the sky that lies exactly above Earth's equator, extending out into space. It is defined as the projection of Earth's equator onto the celestial sphere, making it parallel to Earth's equator and hence perpendicular to Earth's spin axis.

The Celestial Equator Is Defined as the