Which Tolkien poem tells of a mariner who travels to the heavenly realm of Eärendil?

The Tolkien poem about a mariner who travels to the heavenly realm of Eärendil is “The Voyage of Eärendil the Evening Star.”

The poem appears in The Book of Lost Tales 2, edited and published by Christopher Tolkien in 1984. It presents an early version of the Eärendil story, in which the mariner sails toward Valinor and becomes associated with the Evening Star. Tolkien repeatedly revised this myth across different stages of his writings.

Eärendil is a major figure in Tolkien’s First Age mythology. In later versions, he is the father of Elrond and Elros and carries the Silmaril across the sky. His star becomes a sign of hope, and its light is reflected in the phial Galadriel gives Frodo in The Lord of the Rings.

The poem’s title should not be confused with “The Lay of Eärendil,” another title used in Tolkien’s evolving drafts. The wording here identifies the early published poem specifically.