Foam is white and waves are grey;
beyond the sunset leads my way.
Foam is salt, the wind is free;
I hear the rising of the Sea.
Farewell, friends! The sails are set,
the wind is east, the moorings fret.
Shadows long before me lie,
beneath the ever-bending sky,
but islands lie behind the Sun
that I shall raise ere all is done;
lands there are to west of West,
where night is quiet and sleep is rest.
Guided by the Lonely Star,
beyond the utmost harbour-bar,
I'll find the heavens fair and free,
and beaches of the Starlit Sea.
Aka the Morning or Evening star 
 This star is in fact a silmaril (jewels comprised of the light of the two great trees of Valinor), brought into the sky by Eärendil. The light of this star shone in the glass given to Frodo by Galadriel, which provides him hope and courage during his arduous journey. 
 
 Eärendil would father Elrond and Elros (the first Númenorian king). 
 This star is supposed to symbolize Venus.