Question

The celestial sphere is

a. a spherical galaxy, centered on the Sun.
b. the star-sphere discovered by the Greeks and other ancient civilizations which shows the physical location in space of the nearby stars.
b. the orb of the Sun; a normal star.
d. the central spherical region of the Milky Way Galaxy, dense with stars.
e. a useful illusion used to map the stars and other objects in the sky.

Answer 1

e. a useful illusion used to map the stars and other objects in the sky

Step-by-step explanation:

A celestial sphere is a graphical representation whose purpose is to describe the different locations of objects in the sky. A Celestial Sphere depiction contains Earth's rotation axis, North Celestial Pole, South Celestial Pole and Celestial Equator.