What Is the Celestial Sphere

question 92

Multiple Choice

What is the celestial sphere?

• A)The celestial sphere is a representation of how the entire sky looks as seen from Earth.
• B)The celestial sphere is a model that shows the true locations in space of the Sun and a few thousand of the nearest stars.
• C)The celestial sphere is a model of how the stars are arranged in the sky relative to our Sun,which is in the middle of the sphere.
• D)It represents a belief in an Earth-centered universe,and hence is no longer considered to have any use.

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Definitions:

Cross-License

An agreement between two or more parties to grant mutual rights to their respective intellectual property.

Duopoly

Market in which two firms compete with each other.

Cournot Duopolists

Two firms in a market where each firm decides on its output level assuming the output of the other firm is fixed, leading to a stable competition equilibrium.

Equilibrium Prices

The market price at which the supply of an item equals the demand for that item, leading to a stable market condition where there is no surplus or shortage.