What is the celestial sphere in astronomy and navigation?
Q: What is the celestial sphere in astronomy and navigation?
A: The celestial sphere is an imaginary sphere of a very large unspecified size that is used in astronomy and navigation.
Q: How is the celestial sphere related to the earth?
A: The earth and the celestial sphere have the same centre and are concentric. They also rotate upon the same axis.
Q: What is the purpose of the celestial sphere?
A: The celestial sphere is a very practical tool for positional astronomy, as all objects in the sky can be thought of as projected upon it.
Q: Is the celestial sphere a physical object?
A: No, the celestial sphere is an imaginary sphere.
Q: What objects can be thought of as projected upon the celestial sphere?
A: All objects in the sky can be thought of as projected upon the celestial sphere.
Q: How is the celestial sphere useful in navigation?
A: The celestial sphere can be used to determine the position of objects in the sky relative to the observer, which can aid in navigation.
Q: What is the size of the celestial sphere?
A: The size of the celestial sphere is unspecified and is imaginary in nature.
