The Harry Potter Compendium

"Professor Trelawney bent down and lifted, from under her chair, a miniature model of the solar system, contained within a glass dome. It was a beautiful thing; each of the moons glimmered in place around the nine planets and the fiery sun, all of them hanging in thin air beneath the glass. Harry watched lazily as Professor Trelawney began to point out the fascinating angle Mars was making to Neptune."
—Harry Potter's Fourth year Divination class[src]

Orreries are models of the sun, planets and moons of the solar system, used for studying Astronomy. Sybill Trelawney used one of all nine planets (including Pluto) while teaching Astrology during Divination in 1995.[1]

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File:Dumbledore's office UE booklet 1.jpg

Dumbledore's office with orrery-like globes to the bottom left and middle right

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Astronomy
Astronomy Classroom
Professors: Aurora Sinistra
Astronomy at Hogwarts: Astronomy department · Astronomy Tower · Astronomy Room · Astronomy Stairs · Astronomy Corridor · Astronomy reading room ·
Astronomy classroom
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