Astromancy

Astromancy, also known as astrology or astronomy, is divination and fortune-telling through the studying of stars.

Blood elves
Several astromancers mages can be found among the ranks of the blood elves in Netherstorm and the various wings of Tempest Keep:
 * Sunfury Astromancer
 * Sunseeker Astromage
 * Novice Astromancer
 * Astromancer
 * Astromancer Lord
 * Apprentice Star Scryer
 * Star Scryer
 * High Astromancer Solarian
 * Grand Astromancer Capernian

Astromancer Darnarian, while not in Tempest Keep, is a member of the Scryers.

Nightborne
The highborne of Suramar were studying the stars as early as twelve thousand years ago. The nightborne kept on with their studies, and inside the Nighthold is an area called the Astromancer's Rise.
 * Celestial Acolyte
 * Astral Farseer
 * Astral Defender
 * Astrologer Jarin
 * Star Augur Etraeus

Humans

 * One of Medivh's many areas of expertise was astronomy. Karazhan had an observatory called the Celestial Watch.
 * Viktori Prism'Antras was interested into peering towards the stars.
 * Greymane Manor has an observatory.
 * The Empyrean Society count human astrologers among its ranks.
 * Astromancer Arwyn

Orcs
The orcs of the Shadowmoon clan were adepts astrologists.

Draenei
The draenei had a celestial observatory built in, populated by Teluuna Astrologers.

Mogu
Shan'ze Celestial Shapers were situated in the Throne of Thunder.

Titans
A Celestial Planetarium was installed inside Ulduar.

Speculation
Nethermancy could be similar to astromancy, considering the existence of Nether Scryers, Nethermancer Sepethrea and High Nethermancer Zerevor.