Half of Hindu sky map which appeared in a treatise entitled: "Jewel of the Essence of All Sciences". An Islamic view of the constellations. This manuscript synthesizes knowledge of astronomy and includes accounts of the Hindu, Islamic and European systems. Many ancient celestial maps are works of art rather than practical guides to orient in the sky. This one was commissioned by a Hindu monarch in 1840. Although it is decorated with Indian and Arabic, represents many of the constellations we use today. A star chart or star map is a map of the night sky. Astronomers divide these into grids to use them more easily. They are used to identify and locate astronomical objects such as stars, constellations and galaxies. They have been used for human navigation since time immemorial.