one of the sons of Priam and Hecuba. He distinguished himself during the Trojan War by his valour, and by the gift of prophecy which he possessed. He became the captive of Ulysses, who afterwards made him over to Neoptolemus, the son of Achilles. When Neoptolemus returned home, he took his prisoner with him, and assigned Andromache to him as his wife. Helenus afterwards became king of a part of Epirus, and was visited there by Æneas while on his way to Italy.

HELICAL, a term applied to a star or planet, with reference either to its emergence from the light of the sun, or immersion into it. A star is said to rise heliacally when, after being in conjunction with the sun, it gets at such a distance from it as to become visible before sunrise. The heliacal setting of a star denotes its entering into the sun's rays, and thus becoming lost in the superior splendour of that luminary.