This is a an old epiphany song, Quem stella sole pulchrior, by Charles Coffin, translated by John Chandler. It is set to PUER NOBIS, which shares some of the melody of “Hickory Dickory Dock”.
OCP sell the sheet music here.
1 What star is this, with beams so bright,
More lovely than the noonday light?
’Tis sent to announce a newborn King,
Glad tidings of our God to bring.
2 ’Tis now fulfilled what God decreed,
“From Jacob shall a star proceed;”
And lo! the eastern sages stand
To read in heav’n the Lord’s command.
3 The guiding star above is bright;
Within them shines a clearer light,
And leads them on with pow’r benign
To seek the Giver of the sign.
4 O Jesus, while the star of grace
Impels us on to seek your face,
Let not our slothful hearts refuse
The guidance of your light to use.
5 To God the Father, heav’nly Light;
To Christ, revealed in eartly night,
To God the Holy Spirit raise
An endless song of thankful praise!
NB GAB omits the third stanza