The correct option is the planisphere.
The planisphere is the first coordinate of the celestial coordinate system
- The celestial coordinate system is a system of reference to assign positions to objects in the celestial sphere
- The celestial coordinate system is one of the four astronomical coordinate systems
- The other coordinate systems are the equatorial, altazimuth and galactic coordinate systems
- The planisphere is a computing instrument to help in learning about the recognition of stars and constellations
- It can be set to depict an object's location in the sky at any particular date and time
- There are 2 main methods used in planispheres
- The disadvantage is that it can be used only between specific latitudes
The planisphere is used as a reference to find a celestial object's position, hence it is the first coordinate of the celestial coordinate system.
Learn more about the celestial system here:
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