Noun
(astronomy) A map of the night sky used to identify and locate astronomical objects such as stars, constellations and galaxies.
A radar chart.
Source: en.wiktionary.orgSetting circles in conjunction with a star chart or ephemeris allow the telescope to be easily pointed at known objects on the celestial sphere. Source: Internet
Common techniques While a number of interesting celestial objects are readily identified by the naked eye, sometimes with the aid of a star chart, many others are so faint or inconspicuous that technical means are necessary to locate them. Source: Internet
The planisphere was a star chart invented by Abū Rayḥān al-Bīrūnī in the early 11th century. Source: Internet