The English lyrics to "Book of Days" are not a translation of the Irish lyrics. Instead, they are an alternate version produced for the movie Far and Away. The Irish lyrics and their translation are as follows.

Book of Days

 Ó oíche go hoíche, mo thuras,        From night to night, my journey,
 An bealach fada romham.              The long pilgrimage before me.
 Ó lá go lá, mo thuras,               From day to day, my journey,
 na scéalta na mbeidh a choích.       The stories that will be forever.

(Translation by Dave Allum)