A star map / chart is a celestial night sky map with astronomical objects laid out on a grid system. They identify and locate constellations, stars, nebulae, galaxies, and planets. They have been used for human navigation since time immemorial. Note that a star chart differs from an astronomical catalogue, which lists or tabulates astronomical objects for a particular purpose. Tools using a star chart include the astrolabe and planisphere.
Perspective Research Centre 
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