Then Varda went forth from the council, and she looked out from the height of Taniquetil, and beheld the darkness of Middle-earth beneath the innumerable stars, faint and far. Then she began a great labour, greatest of all the works of the Valar since their coming into Arda. She took the silver dews from the vats of Telperion, and therewith she made new stars and brighter against the coming of the Firstborn; wherefore she whose name out of the deeps of time and the labours of Eä was Tintallë, the Kindler, was called after by the Elves Elentári, Queen of the Stars. Carnil and Luinil, Nénar and Lumbar, Alcarinquë and Elemmírë she wrought in that time, and many other of the ancient stars she gathered together and set as signs in the heavens of Arda: Wilwarin, Telumendil, Soronúmë, and Anarríma; and Menelmacar with his shining belt, that forebodes the Last Battle that shall be at the end of days. And high in the north as a challenge to Melkor she set the crown of seven mighty stars to swing, Valacirca, the Sickle of the Valar and sign of doom.
– The Silmarillion, Quenta Silmarillion Chapter III Of the Coming of the Elves and the Captivity of Melkor