Applied by the Persians (c. 3000 B.C.) to the four Royal Stars then at the angles of the Zodiac: the Watcher of the East, then at the Vernal Equinox - Aldebaran; the Watcher of the North, which then marked the Summer Solstice - Regulus; the Watcher of the West, then at the Autumnal Equinox - Antares, the Watcher of the South, which then marked the Winter Solstice - Fomalhaut.
ASTROLABE ENCYCLOPEDIA
