Almighty God,
you have put the sun in the heavens
to scatter the night
and restore morning to the world.
Fill us with your mercy,
enlighten us,
and scatter all the darkness of our sins;
through Jesus Christ our Lord.
Source: Sarum Breviary, from https://www.oursanctuary.net/sarum.html, slightly modified.
In traditional English:
Almighty God,
who has planted the Day-star in the heavens,
and, scattering the night,
dost restore morning to the world,
fill us, we beseech Thee, with Thy mercy,
so that, Thou being our Enlightener,
all the darkness of our sins may be dispersed,
through our Lord Jesus Christ.
A Collection of Prayers 