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A Star chart is a written document. It's used to represent the positions and movements of the stars, pretty much like a map. Astronomers usually use these for research or study. An O.W.L.-level wizard should be able of fill in a blank star chart based on some hours of sky gazing. 
Behind the scenes
- In the 1995–1996 school year, Fifth year O.W.L students had to "fill in a blank star chart" based on a few hours of observing the night sky as part of their O.W.L exam. 
|Professors: Aurora Sinistra|
|Astronomy at Hogwarts: Astronomy department · Astronomy Tower · Astronomy Room · Astronomy Stairs · Astronomy Corridor · Astronomy reading room · |
|Astronomers: Aurora Sinistra · Copernicus · George von Rheticus · Perpetua Fancourt|
|Objects: Globe of the Moon · Lunascope · Moon chart · Orrery · Star chart · Telescope|
|Planets: Jupiter · Mars · Mercury · Neptune · Pluto · Saturn · Uranus · Venus|
|Satellites: Callisto · Europa · Ganymede · Io · Moon|
|Constellations: Bartholomeus · Orion|