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