A bright star, also known as Deneb, the alpha star in the constellation Cygnus (the Swan), forming one corner of the Summer Triangle asterism.
From Arabic dhanab, meaning tail. The star was named by Arab astronomers who saw Cygnus's tail pointing toward this bright star in the night sky.
Dheneb/Deneb is one of the brightest stars visible from Earth and was crucial for navigation in the Indian Ocean trade routes. Medieval Arab and Indian sailors used it to navigate by the stars, making it a navigational landmark for centuries.
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