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"Moon charts are used to study the movement, position, and phases of the moon."
— Description[src]

A moon chart was a written astronomical instrument. It was used to represent the position, movement and phases of the Moon, not unlike a star chart.[2]

Astronomers usually used these for research or study. It was quite difficult to interpret one, so one who had difficulty with these charts should have used a lunascope instead.[1]

They were sold for 5 Galleons at Wiseacre's Wizarding Equipment in Diagon Alley.[2]

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Astronomy
Astronomy Pottermore
Professors: Satyavati Shah · Aurora Sinistra
Astronomy at Hogwarts: Astronomy classroom · Astronomy Corridor · Astronomy Club · Astronomy department · Astronomy homework meeting · Astronomy reading room · Astronomy Room · Astronomy Stairs · Astronomy Tower
Astronomers: Aurora Sinistra · Copernicus · George von Rheticus · Perpetua Fancourt · Hesper Starkey
Objects: Astrolabe · Globe of the Moon · Lunascope · Moon chart · Orrery · Sextant · Star chart · Telescope
Planets: Jupiter · Mars · Mercury · Neptune · Pluto · Rogue planets · Saturn · Uranus · Venus
Satellites: Callisto · Europa · Ganymede · Io · Moon
Constellations: Aquila · Bartholomeus · Cetus · Crater · Dark cloud constellations · Orion · Ursa Major
Other topics: Black holes · Cosmic ages · Dark energy · Dark matter · Eclipse · Lunar phases · Meteor showers · Space weather · Wormholes
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